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Solvability and properties of solutions of nonlinear elliptic equations

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Abstract

The paper contains an exposition of variational and topological methods of investigating general nonlinear operator equations in Banach spaces. Application is given of these methods to the proof of solvability of boundary-value problems for nonlinear elliptic equations of arbitrary order, to the problem of eigenfunctions, and to bifurcation of solutions of differential equations. Results are presented of investigations of the properties of generalized solutions of quasilinear elliptic equations of higher order.

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Literature cited

  1. G. N. Agaev, “On the theory of nonlinear operator equations in Hilbert space,” Izv. Akad. Nauk AzSSR, Ser. Fiz.-Tekh. Mat. Nauk, No. 5, 9–16 (1966).

    Google Scholar 

  2. S. Agmon, A. Douglis, and L. Nirenberg, Estimates Near the Boundary of Solutions of Elliptic Partial Differential Equations with General Boundary Conditions [Russian translation], IL, Moscow (1962).

    Google Scholar 

  3. S. I. Al'ber, “The topology of functional manifolds and global variational calculus,” Usp. Mat. Nauk,25, No. 4, 57–122 (1970).

    Google Scholar 

  4. A. V. Babin, “Finite-dimensionality of kernels and cokernels of quasilinear elliptic mappings,” Mat. Sb.,93, No. 3, 422–450 (1974).

    Google Scholar 

  5. M. S. Berger, “The theory of bifurcations in the case of nonlinear elliptic differential equations and systems,” in: Theory of Bifurcation and Nonlinear Eigenvalue Problems [Russian translation], Mir, Moscow (1974), pp. 71–128.

    Google Scholar 

  6. O. V. Besov, “Investigation of a family of function spaces in connection with imbedding theorems and extensions,” Tr. Mat. Inst. Akad. Nauk SSSR,60, 42–81 (1961).

    Google Scholar 

  7. O. V. Besov, V. P. Il'in, L. D. Kudryavtsev, P. I. Lizorkin, and S. M. Nikol'skii, “The theory of imbeddings of classes of differentiable functions of several variables,” in: Partial Differential Equations [in Russian], Nauka, Moscow (1970), pp. 36–63.

    Google Scholar 

  8. O. V. Besov, V. P. Il'in, and S. M. Nikol'skii, Integral Representations of Functions and Imbedding Theorems [in Russian], Nauka, Moscow (1975).

    Google Scholar 

  9. Yu. G. Borisovich and L. M. Margulis, “On the theory of topological degree of nonlinear, noncompact mappings,” Tr. NII Mat. Voronezh. Univ., No. 5, 19–27 (1972).

    Google Scholar 

  10. Yu. G. Borisovich and Yu. I. Sapronov, “On some topological invariants of nonlinear Fredholm mappings,” Dokl. Akad. Nauk SSSR,196, No. 1, 12–15 (1971).

    Google Scholar 

  11. Yu. G. Borisovich and P. B. Sherman, “On the rotation of Fredholm vector fields,” Tr. NII Voronezh. Univ., No. 2, 31–39 (1970).

    Google Scholar 

  12. M. M. Vainberg, Variational Method and Method of Monotone Operators in the Theory of Nonlinear Equations, Halsted Press (1974).

  13. M. M. Vainberg, “Some questions of differential calculus in linear spaces,” Usp. Mat. Nauk,7, No. 4, 55–102 (1952).

    Google Scholar 

  14. M. M. Vainberg and R. I. Kachurovskii, “On the variational theory of nonlinear operators and equations,” Dokl. Akad. Nauk SSSR,129, No. 6, 1199–1202 (1959).

    Google Scholar 

  15. M. M. Vainberg and V. A. Trenogin, The Theory of Branching of Solutions of Nonlinear Equations [in Russian], Nauka, Moscow (1967).

    Google Scholar 

  16. N. Wiener and R. Paley, The Fourier Transform in the Complex Domain [Russian translation], Nauka, Moscow (1964).

    Google Scholar 

  17. M. I. Vishik, “Quasilinear elliptic systems of equations containing subordinate terms,” Dokl. Akad. Nauk SSSR,144, No. 1, 13–16 (1962).

    Google Scholar 

  18. M. I. Vishik, “Quasilinear strongly elliptic systems of differential equations having divergence form,” Tr. Mosk. Mat. Obshch.,12, 125–184 (1963).

    Google Scholar 

  19. M. I. Vishik, “Boundary-value problems for quasilinear, strongly elliptic systems of equations having divergence form” Dokl. Akad. Nauk SSSR,138, No. 3, 518–521 (1961).

    Google Scholar 

  20. M. I. Vishik, “On the solvability of the first boundary-value problem for quasilinear equations with rapidly increasing coefficients in Orlicz classes,” Dokl. Akad. Nauk SSSR,151, No. 4, 758–761 (1963).

    Google Scholar 

  21. M. I. Vishik, “On the first boundary-value problem for quasilinear elliptic equations and systems of higher order,” in: Materials to the Joint Soviet-American Symposium on Partial Differential Equations [in Russian], Novosibirsk (1963), pp. 3–11.

  22. M. I. Vishik and G. I. Éskin, “Convolution equations in a bounded domain,” Usp. Mat. Nauk,20, No. 3, 89–152 (1965).

    Google Scholar 

  23. I. I. Vorovich, “Some estimates of the number of solutions for the von Karman equations in connection with the problem of the stability of plates and shells,” in: Problems in Hydrodynamics and the Mechanics of Continuous Media [in Russian], Nauka, Moscow (1969), pp. 111–118.

    Google Scholar 

  24. I. I. Vorovich, “On the behavior of plates of arbitrary form after loss of stability,” in: Problems of Mechanics of a Solid Deformable Body [in Russian], Sudostroenie, Leningrad (1970), pp. 113–119.

    Google Scholar 

  25. B. M. Grenader, “On the rotation of vector fields with strictly monotone, semicontinuous operators,” Tr. Mat. Fak. Voronezh. Univ., No. 4, 44–49 (1971).

    Google Scholar 

  26. N. N. Gudovich, “On the application of a difference method to the solution of nonlinear elliptic equations,” Dokl. Akad. Nauk SSSR,179, No. 6, 1257–1260 (1968).

    Google Scholar 

  27. I. I. Danilyuk, “Generalized Morse theory of a class of functionals,” Dop. Akad. Nauk Ukr. RSR,A, No. 1, 17–19 (1971).

    Google Scholar 

  28. I. I. Danilyuk, “On integral functionals with a variable domain of integration,” Tr. Mat. Inst. Akad. Nauk SSSR,118 (1972).

  29. N. Dunford and J. T. Schwartz, Linear Operators, Pt. 1. General Theory, Wiley (1958).

  30. A. D. Dzhabrailov, “Investigation of some classes of quasilinear elliptic equations of second order. I,” Differents. Uravn.,5, No. 12, 2245–2257 (1969).

    Google Scholar 

  31. Yu. A. Dubinskii, “Some integral inequalities and the solvability of degenerate quasilinear elliptic systems of differential equations,” Mat. Sb.,64, No. 3, 458–480 (1964).

    Google Scholar 

  32. Yu. A. Dubinskii, “Quasilinear elliptic and parabolic equations of any order,” Usp. Mat. Nauk,23, No. 1, 45–90 (1968).

    Google Scholar 

  33. Yu. A. Dubinskii, “The first boundary-value problem for degenerate quasilinear elliptic systems of differential equations,” Dokl. Akad. Nauk SSSR,156, No. 5, 1018–1021 (1964).

    Google Scholar 

  34. Yu. A. Dubinskii, “Weak convergence in nonlinear elliptic and parabolic equations,” Mat. Sb.,67, No. 4, 609–642 (1965).

    Google Scholar 

  35. Yu. A. Dubinskii, “On an operator scheme and the solvability of a number of quasilinear equations of mechanics,” Dokl. Akad. Nauk SSSR,176, No. 3, 506–508 (1967).

    Google Scholar 

  36. Yu. A. Dubinskii, “On the solvability of a system of equations for the strong bending of plates,” Dokl. Akad. Nauk SSSR,175, No. 5, 1026–1029 (1967).

    Google Scholar 

  37. Yu. A. Dubinskii, “On some noncoercive nonlinear equations,” Mat. Sb.,87, No. 3, 315–323 (1972).

    Google Scholar 

  38. Yu. A. Dubinskii and S. I. Pokhozhaev, “On a class of operators and the solvability of quasilinear elliptic equations,” Mat. Sb.,72, No. 2, 226–236 (1967).

    Google Scholar 

  39. J. A. Dieudonne, Foundations of Modern Analysis [Russian translation], Mir, Moscow (1964).

    Google Scholar 

  40. P. P. Zabreiko, R. I. Kachurovskii, and M. A. Krasnosel'skii, “On a fixed-point principle for operators in Hilbert space,” Dunkts. Analiz Prilozhen.,1, No. 2, 93–94 (1967).

    Google Scholar 

  41. P. P. Zabreiko and M. A. Krasnosel'skii, “On a technique for obtaining new fixed-point principles,” Dokl. Akad. Nauk SSSR,176, No. 6, 1233–1235 (1967).

    Google Scholar 

  42. A. Zygmund, Trigonometric Series, Cambridge Univ. Press (1968).

  43. J. Eells, Foundations of Global Analysis, Usp. Mat. Nauk,24, No. 3, 157–210 (1969).

    Google Scholar 

  44. J. Eells, “Fredholm structures,” Usp. Mat. Nauk,26, No. 6, 213–240 (1971).

    Google Scholar 

  45. V. P. Il'in and V. A. Solonnikov, “On some properties of differentiate functions of several variables,” Tr. Mat. Inst. Akad. Nauk SSSR,66, 205–226 (1962).

    Google Scholar 

  46. R. I. Kachurovskii, “On monotone operators and convex functionals,” Usp. Mat. Nauk,15, No. 4, 213–215 (1960).

    Google Scholar 

  47. R. I. Kachurovskii, “On some problems in the theory of plasticity,” Dokl. Akad. Nauk SSSR,196, No. 4, 761–763 (1971).

    Google Scholar 

  48. R. I. Kachurovskii, “On a class of nonlinear operator equations and some equations of mechanics,” Sib. Mat. Zh.,12, No. 2, 353–366 (1971).

    Google Scholar 

  49. R. I. Kachurovskii, “Nonlinear monotone operators in Banach spaces,” Usp. Mat. Nauk,23, No. 2, 121–168 (1968).

    Google Scholar 

  50. N. V. Kirpotina, “On the theory of systems of nonlinear integral equations,” in: Funkts. Analiz Primen., Akad. Nauk AzSSR, Baku (1961), pp. 113–119.

    Google Scholar 

  51. V. S. Klimov, “Continuous branches of eigenfunctions of quasilinear elliptic problems,” Differents. Uravn.,9, No. 10, 1845–1850 (1973).

    Google Scholar 

  52. V. I. Kondrashov, “On the theory of nonlinear and linear eigenvalue problems,” Dokl. Akad. Nauk SSSR,90, No. 2, 129–132 (1953).

    Google Scholar 

  53. A. I. Koshelev, “A priori estimates in Lp and generalized solutions of elliptic equations and systems,” Usp. Mat. Nauk,13, No. 4, 29–88 (1958).

    Google Scholar 

  54. A. I. Koshelev, “On some questions of existence and approximate solution for quasilinear elliptic equations and systems in the spaces of S. L. Sobolev,” Sib. Mat. Zh.,9, No. 5, 1173–1181 (1968).

    Google Scholar 

  55. M. A. Krasnosel'skii, “On some new fixed-point principles,” Dokl. Akad. Nauk SSSR,208, No. 6, 1280–1281 (1973).

    Google Scholar 

  56. M. A. Krasnosel'skii, Topological Methods in the Theory of Nonlinear Integral Equations, Pergamon (1964).

  57. M. A. Krasnosel'skii, P. P. Zabreiko, E. I. Pustyl'nik, and P. E. Sobolevskii, Integral Operators in Spaces of Summable Functions [in Russian], Nauka, Moscow (1966).

    Google Scholar 

  58. M. A. Krasnosel'skii and Ya. B. Rutitskii, Convex Functions and Orlich Spaces [in Russian], Fizmatgiz, Moscow (1958).

    Google Scholar 

  59. A. Kratokhvil and I. Nechas, “On the discreteness of the spectrum of a nonlinear Sturm-Liouville equation of fourth order,” in: Application of Functional Methods to Boundary Value Problems of Mathematical Physics [in Russian], Novosibirsk (1972), pp. 107–121.

  60. S. G. Krein and A. S. Simonov, “A theorem on homeomorphisms and quasilinear equations,” Dokl. Akad. Nauk SSSR,167, No. 3, 1226–1229 (1966).

    Google Scholar 

  61. S. N. Kruzhkov, “A priori estimates and some properties of solutions of elliptic and parabolic equations,” Mat. Sb.,65, No. 4, 522–570 (1964).

    Google Scholar 

  62. O. A. Ladyzhenskaya and N. N. Ural'tseva, Linear and Quasilinear Elliptic Equations, Academic Press (1968).

  63. O. A. Ladyzhenskaya and N. N. Ural'tseva, Linear and Quasilinear Equations of Elliptic Type, Academic Press (1968).

  64. O. A. Ladyzhenskaya and N. N. Ural'tseva, “On a variational problem and quasilinear elliptic equations with many independent variables,” Dokl. Akad. Nauk SSSR,135, No. 6, 1330–1334 (1960).

    Google Scholar 

  65. S. Lang, Differential Manifolds, Addison-Wesley (1972).

  66. J. Leray and J. Schauder, “Topology and functional equations,” Usp. Mat. Nauk,1, Nos. 3–4, 71–95 (1946).

    Google Scholar 

  67. J. L. Lions, “On partial differential inequalities,” Usp. Mat. Nauk,26, No. 2, 205–263 (1971).

    Google Scholar 

  68. J. L. Lions, Some Methods of Solving Nonlinear Boundary Value Problems [Russian translation], Mir, Moscow (1972).

    Google Scholar 

  69. Ya. B. Lopatin'skii, “On an application of the methods of M. Morse in the theory of differential equations of elliptic type,” Dokl. Akad. Nauk Ukr. RSR,A, No. 6, 515–518 (1968).

    Google Scholar 

  70. L. A. Lyusternik, “The topology of function spaces and global variational calculus,” Tr. Mat. Inst. Akad. Nauk SSSR,19, 1–96 (1947).

    Google Scholar 

  71. L. A. Lyusternik, “On a class of nonlinear operators in Hilbert space,” Izv. Akad. Nauk SSSR, Ser. Mat., No. 3, 257–264 (1939).

    Google Scholar 

  72. L. A. Lyusternik and L. G. Shnirel'man, “Topological methods in variational problems and their applications to the differential geometry of surfaces,” Usp. Mat. Nauk,2, No. 1, 166–217 (1947).

    Google Scholar 

  73. E. Magenes, “Interpolation spaces and partial differential equations,” Usp. Mat. Nauk,21, No. 2, 169–218 (1966).

    Google Scholar 

  74. V. G. Maz'ya, “Classes of domains and imbedding theorems for function spaces,” Dokl. Akad. Nauk SSSR,133, No. 3, 527–530 (1960).

    Google Scholar 

  75. V. G. Maz'ya, “Examples of nonregular solutions of quasilinear elliptic equations with analytic coefficients,” Punkts. Analiz Prilozhen.,2, No. 3, 53–57 (1968).

    Google Scholar 

  76. V. G. Maz'ya, “On removable singularities of bounded solutions of quasilinear elliptic equations of arbitrary order,” Zap. Nauchn. Sem. Leningr. Otd. Mat. Inst. Akad. Nauk SSSR,27, 116–130 (1972).

    Google Scholar 

  77. J. W. Milnor, Morse Theory, Princeton Univ. Press (1963).

  78. P. D. Mil'man, “Fixed points and degree of mapping,” Mat. Sb.,87, No. 2, 175–292 (1972).

    Google Scholar 

  79. C. Miranda, Partial Differential Equations of Elliptic Type, Springer-Verlag (1970).

  80. S. G. Mikhlin, The Problem of the Minimum of a Quadratic Functional, Holden-Day (1965).

  81. I. Nechas, “On the discreteness of the spectrum of a nonlinear Sturm-Liouville equation,” Dokl. Akad. Nauk SSSR,201, No. 5, 1045–1048 (1971).

    Google Scholar 

  82. S. M. Nikol'skii, Approximation of Functions of Several Variables and Embedding, Springer-Verlag (1974).

  83. L. Nirenberg, “Some questions in the theory of linear and nonlinear partial differential equations,” Usp. Mat. Nauk,18, No. 4, 101–118 (1963).

    Google Scholar 

  84. O. A. Oleinik, “On Hilbert's 19th problem,” in: Hilbert's Problem [in Russian], Nauka, Moscow (1969), pp. 216–219.

    Google Scholar 

  85. B. P. Petrivskii and I. V. Skrypnik, “On the regularity of generalized solutions of quasilinear elliptic systems of arbitrary order,” in: Matematicheskii Sbornik, Kiev (1976), pp. 34–37.

  86. I. G. Petrovskii, “On the analyticity of solutions of partial differential equations,” Mat. Sb.,5, No. 1, 3–68 (1939).

    Google Scholar 

  87. V. I. Plotnikov, A. G. Sigalov, and N. N. Ural'tseva, “Quasilinear elliptic equations and variational problems,” Proceedings of the Fourth All-Union Mat. Congr., 1961, Leningrad, Akad. Nauk SSSR (1963), pp. 199–214.

    Google Scholar 

  88. M. M. Postnikov, “Banach manifolds,” Fourth Mathematical Summer School, Kiev (1968), pp. 234–269.

    Google Scholar 

  89. M. M. Postnikov, Introduction to Morse Theory [in Russian], Nauka, Moscow (1971).

    Google Scholar 

  90. S. I. Pokhozhaev, “Normal solvability of nonlinear equations in uniformly convex Banach spaces,” Funkts. Analiz Prilozhen.,3, No. 2, 80–84 (1969).

    Google Scholar 

  91. S. I. Pokhozhaev, “On the solvability of nonlinear equations with odd operators,” Funkts. Analiz Prilozhen.,1, No. 3, 66–73 (1967).

    Google Scholar 

  92. S. I. Pokhozhaev, “On nonlinear operators having weakly closed range and quasilinear elliptic equations,” Mat. Sb.,78, No. 2, 236–259 (1969).

    Google Scholar 

  93. S. I. Pokhozhaev, “On the eigenfunctions of quasilinear elliptic problems,” Mat. Sb.,82, No. 2, 192–212 (1970).

    Google Scholar 

  94. S. I. Pokhozhaev, “On the set of critical values of functionals,” Mat. Sb.,75, No. 1, 106–111 (1968).

    Google Scholar 

  95. Hilbert's Problems [in Russian], Nauka, Moscow (1969), p. 239.

  96. B. N. Sadovskii, “Limiting compact and contractive operators,” Usp. Mat. Nauk,27, No. 1, 81–146 (1972).

    Google Scholar 

  97. A. G. Sigalov, “On the 19th and 20th problems of Hilbert,” in: Hilbert's Problems [in Russian], Nauka, Moscow (1969), pp. 204–215.

    Google Scholar 

  98. A. S. Simonov, “On the solvability of the Dirichlet problem for quasilinear elliptic equations,” Dal'nevost. Mat. Sb.,1, 109–112 (1970).

    Google Scholar 

  99. I. V. Skrypnik, Nonlinear Elliptic Equations of Higher Order [in Russian], Naukova Dumka, Kiev (1973).

    Google Scholar 

  100. I. V. Skrypnik, “On the regularity of generalized solutions of quasilinear elliptic equations of arbitrary order,” Dokl. Akad. Nauk SSSR,203, No. 1, 36–38 (1972).

    Google Scholar 

  101. I. V. Skrypnik, “On the regularity of solutions of quasilinear elliptic equations on the plane,” Mat. Fiz., Resp. Mezhved. Sb., No. 11, 137–145 (1972).

    Google Scholar 

  102. I. V. Skrypnik, “The behavior near the boundary of solutions of quasilinear elliptic equations on the plane,” Mat. Fiz., Resp. Mezhved. Sb., No. 11, 146–148 (1972).

    Google Scholar 

  103. I. V. Skrypnik, “Computation of the index of a critical point,” Dop. Akad. Nauk Ukr. RSR,A, No. 6, 527–529 (1972).

    Google Scholar 

  104. I. V. Skrypnik, Quasilinear Elliptic Equations of Higher Order [in Russian], Izd. DonGU (1971).

  105. I. V. Skrypnik, “A condition for the regularity of generalized solutions of quasilinear elliptic equations of higher order,” Izv. Akad. Nauk SSSR, Ser. Mat.,37, No. 6, 1376–1427 (1973).

    Google Scholar 

  106. I. V. Skrypnik, “Nonlinear elliptic equations of higher order,” Annot. Dokl. Sem. Inst. Prikl. Mat. Tbilis. Univ.,7, 51–52 (1973).

    Google Scholar 

  107. I. V. Skrypnik, “On the question of application of approximation methods in variational problems,” Mat. Fiz. Resp. Mezhved. Sb., No. 7, 156–163 (1970).

    Google Scholar 

  108. I. V. Skrypnik, “On conditions on the coefficients of quasilinear elliptic equations of higher order,” in: Matematicheskii Sbornik, Kiev (1976), pp. 93–94.

  109. I. V. Skrypnik, “On quasilinear elliptic equations of higher order with continuous generalized solutions,” in: Mathematicheskii Sbornik, Kiev (1976), pp. 90–93.

  110. I. V. Skrypnik, “On the continuity of generalized solutions of elliptic equations of higher order,” Dop. Akad. Nauk Ukr. RSR,A, No. 1, 43–45 (1973).

    Google Scholar 

  111. I. V. Skrypnik, “On the regularity of generalized solutions of quasilinear elliptic equations on the plane,” Dop. Akad. Nauk Ukr. RSR,A, No. 3, 217–219 (1973).

    Google Scholar 

  112. I. V. Skrypnik, “Application of topological methods to equations with monotone operators,” Ukr. Mat. Zh.,24, No. 1, 69–79 (1972).

    Google Scholar 

  113. I. V. Skrypnik, “On the solvability of nonlinear equations with monotone operators,” Dop. Akad. Nauk Ukr. RSR,A, No. 1, 32–35 (1970).

    Google Scholar 

  114. I. V. Skrypnik, “Nonlinear elliptic equations of higher order,” Doctoral Diss., IPMM AN Ukr. SSR (1972).

  115. I. V. Skrypnik, “On the solvability of a nonlinear Neumann problem,” Dop. Akad. Nauk Ukr. RSR,A, No. 11, 989–992 (1971).

    Google Scholar 

  116. I. V. Skrypnik, “On the solvability and generalization of the Galerkin method in a number of nonlinear problems of mechanics,” Mat. Fiz. Resp. Mezhved. Sb., No. 15, 152–159 (1974).

    Google Scholar 

  117. I. V. Skrypnik, “On the spectrum of a class of nonlinear operators,” Dop. Akad. Nauk Ukr. RSR,A, No. 11, 998–1000 (1970).

    Google Scholar 

  118. I. V. Skrypnik, “On problems with bifurcation points,” Dop. Akad. Nauk Ukr. RSR,A, No. 2, 126–128 (1971).

    Google Scholar 

  119. I. V. Skrypnik, “Points of bifurcation of variational problems,” Mat. Fiz. Resp. Mezhved., No. 9, 117–123 (1971).

    Google Scholar 

  120. I. V. Skrypnik, “On points of bifurcation of elliptic variational problems,” Mat. Fiz. Resp. Mezhved., No. 10, 156–160 (1971).

    Google Scholar 

  121. I. V. Skrypnik, “On the bifurcation of equilibrium of flexible plates,” Mat. Fiz. Resp. Mezhved., No. 13, 159–161 (1973).

    Google Scholar 

  122. I. V. Skrypnik, “On the differentiability of integral functionals,” Dop. Akad. Nauk Ukr. RSR,A, No. 12, 1086–1089 (1972).

    Google Scholar 

  123. I. V. Skrypnik, “On the applications of methods of Morse to nonlinear elliptic equations,” Dokl. Akad. Nauk SSSR,202, No. 4, 769–771 (1972).

    Google Scholar 

  124. V. P. Shcherbina, “On the bifurcation of solutions of nondivergence boundary value problems,” Mat. Fiz. Resp. Mezhved. Sb., No. 19, 108–113 (1976).

    Google Scholar 

  125. V. I. Sobolev, “On the eigenelements of some nonlinear operators,” Dokl. Akad. Nauk SSSR,31, No. 8, 734–736 (1941).

    Google Scholar 

  126. S. L. Sobolev, Applications of Functional Analysis in Mathematical Physics, Am. Math. Soc. (1969).

  127. V. A. Solonnikov, “On differential properties of weak solutions of quasilinear elliptic equations,” Zap. Nauchn. Sem. Leningr. Otd. Mat. Inst. Akad. Nauk SSSR,39, 110–119 (1974).

    Google Scholar 

  128. S. G. Suvorov, “Eigenvalues of some nonlinear operators,” Dop. Akad. Nauk Ukr. RSR,A, No. 6, 501–504 (1970).

    Google Scholar 

  129. T. G. Todorov, “Continuity of solutions of quasilinear elliptic equations and systems of higher order,” Candidate's Dissertation, Leningrad Univ. (1974).

  130. A. I. Fet, “A generalization of the theorem of Lyusternik-Shnirel'man on coverings of spheres and some related theorems,” Dokl. Akad. Nauk SSSR,95, No. 6, 1149–1151 (1954).

    Google Scholar 

  131. A. S. Fokht, “On differential properties of solutions of a class of quasilinear equations of elliptic type,” Uch. Zap. Mosk. Obl. Ped. Inst.,269, No. 14, 241–249 (1969) (1970).

    Google Scholar 

  132. S. V. Frolov and L. É. Él'sgol'ts, “A lower bounded for the number of critical values of a function defined on a manifold,” Mat. Sb.,42 (1935).

  133. R. L. Frum-Ketkov, “On mappings in Hilbert space,” Dokl. Akad. Nauk SSSR,192, No. 6, 1231–1234 (1970).

    Google Scholar 

  134. R. L. Frum-Ketkov, “On mappings into the sphere of a Banach space,” Dokl. Akad. Nauk SSSR,175, No. 6, 1229–1231 (1967).

    Google Scholar 

  135. É. S. Tsitlanadze, “Some questions in the theory of nonlinear operators and variational calculus in spaces of Banach type,” Usp. Mat. Nauk,5, No. 4, 141–142 (1950).

    Google Scholar 

  136. A. I. Shnirel'man, “Degree of a quasilinear mapping and the nonlinear Hilbert problem,” Mat. Sb.,89, No. 3, 366–389 (1972).

    Google Scholar 

  137. V. P. Shcherbina, “On the rotation of the vector field for a certain class of operators,” Mat. Fiz. Resp. Mezhved. Sb., No. 16, 190–193 (1974).

    Google Scholar 

  138. G. N. Yakovlev, “On weak solutions of quasilinear elliptic systems of second order,” Differents. Uravn.,6, No. 1, 157–163 (1970).

    Google Scholar 

  139. G. N. Yakovlev, “On solutions of a class of quasilinear elliptic equations of second order,” Dokl. Akad. Nauk SSSR,202, No. 5, 1020–1023 (1972).

    Google Scholar 

  140. F. J. Almgren, Jr., “Existence and regularity almost everywhere of solutions to elliptic variational problems on surfaces of varying topological type and singularity structure,” Ann. Math.,87, No. 2, 321–391 (1968).

    Google Scholar 

  141. M. Altman, “Generalized gradient methods of minimizing a functional,” Bull. Acad. Pol. Sci. Ser. Sci. Math., Astron. et Phys.,14, No. 6, 313–318 (1966).

    Google Scholar 

  142. H. Amann, “Existence of multiple solutions for nonlinear elliptic boundary-value problems,” Indiana Univ. Math. J.,21, No. 10, 925–935 (1972).

    Google Scholar 

  143. A. Ambrosetti, “Esistenza di infinite soluzioni per problemi non lineari in assenza di parametro,” Atti Accad. Naz. Lincei Rend. Cl. Sci. Fis., Mat. e Natur.,52, No. 5, 660–667 (1972).

    Google Scholar 

  144. H. Beckert, “Über nichtlineare Eigenwertprobleme von Differentialgleichungssystemen höherer Ordnung,” Schriftenz. Inst. Math. Dtsch. Akad. Wiss. Berlin,A, No. 8, 79–90 (1971).

    Google Scholar 

  145. M. Berger and M. Berger, Perspectives in Nonlinearity. An Introduction to Nonlinear Analysis, Benjamin, New York (1968).

    Google Scholar 

  146. M. S. Berger, “A Sturm-Liouville theorem for nonlinear elliptic partial differential equations,” Ann. Scuola Norm. Super. Pisa.,20, No. 3, 543–582 (1966).

    Google Scholar 

  147. M. S. Berger, “New applications of the calculus of variations in the large to nonlinear elasticity,” Commun. Math. Phys.,35, No. 2, 141–150 (1974).

    Google Scholar 

  148. M. S. Berger, “Bifurcation theory and the type numbers of Marston Morse,” Proc. Natl. Acad. Sci. USA,69, No. 7, 1737–1738 (1972).

    Google Scholar 

  149. M. S. Berger, “An eigenvalue problem for nonlinear elliptic partial differential equations,” Trans. Am. Math. Soc.,120, No. 1, 145–184 (1965).

    Google Scholar 

  150. M. S. Berger, “An eigenvalue problem for quasilinear elliptic partial differential equations,” Bull. Am. Math. Soc.,71, No. 1, 171–175 (1965).

    Google Scholar 

  151. M. S. Berger, “On von Karman's equations and the buckling of a thin elastic plate. I. The clamped plate,” Commun. Pure Appl. Math.,20, No. 4, 687–719 (1967).

    Google Scholar 

  152. S. N. Bernstein, “Sur la nature analitique des solutions de certaines equations aux derivees partielles du second ordre,” Math. Ann.,54, 20–76 (1904).

    Google Scholar 

  153. H. Brezis, “Equations et inequations non lineaires dans les espaces vectoriels en dualite,” Ann. Inst. Fourier. Grenoble,18, No. 1, 115–175 (1968).

    Google Scholar 

  154. F. E. Browder, “Existence theory for boundary value problems for quasilinear elliptic systems with strongly nonlinear lower order terms,” Proc. Symp. Pure Math. Berkeley, Calif., 1971, Vol. 23, Providence, R. I. (1973), pp. 269–286.

    Google Scholar 

  155. F. E. Browder, “Pseudomonotone operators and the direct method of the calculus of variations,” Arch. Rat. Mech. Anal.,38, No. 4, 268–277 (1970).

    Google Scholar 

  156. F. E. Browder, “On a theorem of Beurling and Livingston,” Can. J. Math.,17, No. 3, 367–372 (1965).

    Google Scholar 

  157. F. E. Browder, “Nonlinear eigenvalue problems and group invariance,” Functional Analysis and Related Fields. Berlin et al. (1970), pp. 1–58.

  158. F. E. Browder, “Nonlinear mappings of analytic type in Banach spaces,” Math. Ann.,185, No. 4, 259–278 (1970).

    Google Scholar 

  159. F. E. Browder, “Variational methods for nonlinear elliptic eigenvalue problems,” Bull. Am. Math. Soc.,71, No. 1, 176–183 (1965).

    Google Scholar 

  160. F. E. Browder, “Remarks on the direct method of the calculus of variations,” Arch. Rat. Mech. Anal.,20, No. 4, 251–258 (1965).

    Google Scholar 

  161. F. E. Browder, “Nonlinear elliptic boundary-value problems. II,” Trans. Am. Math. Soc.,117, No. 5, 530–550 (1965).

    Google Scholar 

  162. F. E. Browder, “Nonlinear eigenvalue problems and Galerkin approximations,” Bull. Am. Math. Soc.,74, No. 4, 651–656 (1968).

    Google Scholar 

  163. F. E. Browder, “Nonlinear elliptic boundary-value problems and the generalized topological degree,” Bull. Am. Math. Soc.,76, No. 5, 999–1005 (1970).

    Google Scholar 

  164. F. E. Browder, “Lusternik-Schnirelman category and nonlinear elliptic eigenvalue problems,” Bull. Am. Math. Soc.,71, No. 4, 644–648 (1965).

    Google Scholar 

  165. F. E. Browder, “Topological methods for nonlinear elliptic equations of arbitrary order,” Pac. J. Math.,17, No. 1, 17–31 (1966).

    Google Scholar 

  166. F. E. Browder, “Infinite dimensional manifolds and nonlinear elliptic eigenvalue problems,” Ann. Math.,82, No. 3, 459–477 (1965).

    Google Scholar 

  167. F. E. Browder, “On the Fredholm alternative for nonlinear operators,” Bull. Am. Math. Soc.,76, No. 5, 993–998 (1970).

    Google Scholar 

  168. F. E. Browder, “Topology and nonlinear functional equations,” Stud. Math.,31, No. 2, 189–204 (1968).

    Google Scholar 

  169. F. E. Browder, “Approximation-solvability of nonlinear functional equations in normed linear spaces,” Arch. Rat. Mech. Anal.,26, No. 1, 33–49 (1967).

    Google Scholar 

  170. F. E. Browder, Problemes Non-Lineaires, Les Presses de l'Universite de Montreal (1966).

  171. F. E. Browder and C. P. Gupta, “Topological degree and nonlinear mappings of analytic type in Banach spaces,” J. Math. Anal. Appl.,26, No. 2, 390–402 (1969).

    Google Scholar 

  172. F. E. Browder and R. D. Nussbaum, “The topological degree for noncompact nonlinear mappings in Banach spaces,” Bull. Am. Math. Soc.,74, No. 4, 671–676 (1968).

    Google Scholar 

  173. F. E. Browder and W. V. Petryshyn, “The topological degree and Galerkin approximations for non-compact operators in Banach spaces,” Bull. Am. Math. Soc.,74, No. 4, 641–646 (1968).

    Google Scholar 

  174. F. E. Browder and W. V. Petryshyn, “Approximation methods and the generalized topological degree for nonlinear mappings in Banach spaces,” J. Funct. Anal.,3, No. 2, 217–245 (1969).

    Google Scholar 

  175. F. Colombini, “Un teoreme di regolarita alla frontiera per soluaioni di sistemi ellittici quasilineari,” Ann. Acuola Norm. Super. Pisa. Sci. Fix. e Mat.,25, No. 1, 115–161 (1971).

    Google Scholar 

  176. J. S. Cronin, “Topological degree and the number of solutions of equations,” Duke Math. J.,38, No. 3, 531–538 (1971).

    Google Scholar 

  177. J. S. Cronin, Fixed Points and Topological Degree in Nonlinear Analysis, Am. Math. Soc., Providence, Rhode Island (1964).

    Google Scholar 

  178. J. M. Cushing, “Global branches of solutions to nonlinear elliptic eigenvalue problems,” Indiana Univ. Math. J.,20, No. 11, 1035–1045 (1971).

    Google Scholar 

  179. E. N. Dancer, “Bifurcation theory in a real Banach space,” Proc. London Math. Soc.,23, No. 4, 699–734 (1971).

    Google Scholar 

  180. G. Dinca, Operatori Monotoni in Teoria Plasticitatii, Bucuresti, Acad. RSR (1972).

  181. G. Dinca, “Operatori monotoni in teoria plasticitatii,” Stud. si Cerc. Mat.,22, No. 5, 701–755 (1970).

    Google Scholar 

  182. T. Donaldson, “Nonlinear elliptic boundary-value problems in Orlicz-Sobolev spaces,” J. Diff. Equations,10, No. 3, 507–528 (1971).

    Google Scholar 

  183. M. Edelstein, “On the nearest points of sets in uniformly convex Banach spaces,” J. London Math. Soc.,43, 375–377 (1968).

    Google Scholar 

  184. D. E. Edmunds and I. R. L. Webb, “A Leray-Schauder theorem for a class of nonlinear operators,” Math. Ann.,182, No. 3, 207–212 (1969).

    Google Scholar 

  185. Ch. Fenske, “Leray-Schauder Theorie für eine Klasse differenzierbarer Abbildungen in Banachraumen,” Ber. Ges. Math. und Datenverarb., No. 48 (1971).

  186. P. M. Fitzpatrick, “A-proper mappings and their uniform limits,” Bull. Am. Math. Soc.,78, No. 5, 806–809 (1972).

    Google Scholar 

  187. P. M. Fitzpatrick, “A generalized degree for uniform limits of A-proper mappings,” J. Math. Anal. Appl.,35, No. 3, 536–552 (1971).

    Google Scholar 

  188. P. M. Fitzpatrick, “On the structure of the set of solutions of equations involving A-proper mappings,” Trans. Am. Math. Soc.,189, 107–131 (1974).

    Google Scholar 

  189. J. Frehse, “On the boundedness of weak solutions of higher order nonlinear elliptic partial differential equations,” Boll. Unione Mat. Ital.,3, No. 4, 607–627 (1970).

    Google Scholar 

  190. J. Frehse, “A regularity result for nonlinear elliptic systems,” Math. Z.,121, No. 4, 305–310 (1971).

    Google Scholar 

  191. J. Frehse, “Una generalizzazione di un controesempio di De Giorgi nella teoria delle equazioni ellittiche,” Boll. Unione Mat. Ital.,3, No. 6, 998–1002 (1970).

    Google Scholar 

  192. J. Frehse, “Zum Differenzierbarkeitsproblem bei Variationsungleichungen höherer Ordnung,” Abh. Math. Semin. Univ. Hamburg,36, 140–149 (1971).

    Google Scholar 

  193. S. Fučik, “Fixed point theorems based on Leray-Schauder degree,” Comment. Math. Univ. Carol.,8, No. 4, 683–690 (1967).

    Google Scholar 

  194. S. Fučik, “Note on the Fredholm alternative for nonlinear operators,” Comment. Math. Univ. Carol.,12, No. 2, 213–226 (1971).

    Google Scholar 

  195. S. Fučik, “Fredholm alternative for nonlinear operators in Banach spaces and its applications to differential and integral equations,” Cas. Pestov. Mat.,96, No. 4, 371–390 (1971).

    Google Scholar 

  196. S. Fučik, “Fredholm alternative for nonlinear operators in Banach spaces and its applications to the differential and integral equations,” Comment. Math. Univ. Carol.,11, No. 2, 271–284 (1970).

    Google Scholar 

  197. S. Fučik and J. Necas, “Ljusternik-Schnirelman theorem and nonlinear eigenvalue problems,” Math. Nachr.,53, Nos. 1–6, 277–289 (1972).

    Google Scholar 

  198. S. Fučik, J. Necas, J. Souček, and V. Souček, “Spectral analysis of nonlinear operators,” Lect. Notes Math.,346 (1973).

  199. S. Fučik, J. Necas, J. Souček, and V. Souček, “Upper bound for the number of critical levels for non-linear operators in Banach spaces of the type of second order nonlinear partial differential operators,” J. Funct. Anal.,11, No. 3, 314–333 (1972).

    Google Scholar 

  200. S. Fučik, J. Necas, J. Souček, and V. Souček, “Upper bound for the number of eigenvalues for non-linear operators,” Ann. Scuola Norm. Super. Pisa. Sci. Fis. e Mat.,27, No. 1, 53–71 (1973).

    Google Scholar 

  201. S. Fučik, J. Necas, J. Souček, and V. Souček, “Krasnoselskii's main bifurcation theorem,” Arch. Rat. Mech. Anal.,54, No. 4, 328–339 (1974).

    Google Scholar 

  202. S. Fučik, J. Necas, J. Souček, and V. Souček, “New infinite dimensional versions of Morse-Sard theorem,” Boll. Unione Mat. Ital.,6, No. 3, 317–322 (1972).

    Google Scholar 

  203. S. Fučik, J. Necas, J. Souček, and V. Souček, “Strengthening upper bound for the number of critical levels of nonlinear functionals,” Comment. Math. Univ. Carol.,13, No. 2, 297–310 (1972).

    Google Scholar 

  204. H. Gajewski, “Über eine Klasse nichtlinearer Gleichungen mit monotonen Operatoren,” Math. Nachr.,40, Nos. 4–6 (1969).

  205. E. de Giorgi, “Sulla diferenziabilita e l'analiticita delle estremali degli integrali multipli regolari,” Memorie delle Accad. Sci. Torino, Ser. 3,3, No. 1, 25–43 (1957).

    Google Scholar 

  206. E. de Giorgi, “Un esempio di estremali discontinue per un problema variazionale di tipo ellittico,” Boll. Unione Mat. Ital.,1, No. l, 135–137 (1968).

    Google Scholar 

  207. E. Giusti, “Un'aggiunta alla mianota: Regolarita parziala delle soluzioni di sistemi ellittici quasilineari di ordine arbitrario,” Ann. Scuola Norm. Super. Pisa. Sci. Fis. Mat.,27, No. 1, 161–166 (1973).

    Google Scholar 

  208. E. Giusti, “Regolarita parziale delle soluzioni di sistemi ellittici quasilineari di ordine arbitrario,” Ann. Scuola Norm. Super. Pisa. Sci. Fis. Mat.,23, No. 1, 115–141 (1969).

    Google Scholar 

  209. E. Giusti and M. Miranda, “Sulla regolarita delle soluzioni deboli di una classe di sistemi ellittici quasilineari,” Arch. Rat. Mech. Anal.,31, No. 3, 173–184 (1968).

    Google Scholar 

  210. E. Giusti and M. Miranda, “Un esempio di soluzioni discontinue per un problema di minimo relativo ad un integrale regolare del calcolo delle variazioni,” Boll. Unione Mat. Ital.,1, No. 2, 219–226 (1968).

    Google Scholar 

  211. J. P. Gossez, “Nonlinear elliptic boundary-value problems for equations with rapidly (or slowly) increasing coefficients,” Trans. Am. Math. Soc.,190, 163–206 (1974).

    Google Scholar 

  212. J. P. Gossez and P. Hess, “Sur certains problemes aux limites elliptiques fortement non lineaires,” C. R. Acad. Sci.,A278, No. 5, 343–345 (1974).

    Google Scholar 

  213. W. S. Hall, “The bifurcation of solutions in Banach spaces,” Trans. Am. Math. Soc.,161, 207–218 (1971).

    Google Scholar 

  214. J. A. Hempel, “Multiple solutions for a class of nonlinear boundary-value problems,” Indiana Univ. Math. J.,20, No. 11, 989–996 (1971).

    Google Scholar 

  215. P. Hess, “Nonlinear functional equations and eigenvalue problems in nonseparable Banach spaces,” Comment. Math. Helv.,46, No. 3, 314–323 (1971).

    Google Scholar 

  216. P. Hess, “A strongly nonlinear elliptic boundary-value problem,” J. Math. Anal. Appl.,43, No. 1, 241–249 (1973).

    Google Scholar 

  217. P. Hess, “On nonlinear mappings of monotone type homotopic to odd operators,” J. Funct. Anal.,11, No. 2, 138–167 (1972).

    Google Scholar 

  218. P. Hess, “On a method of singular perturbation type for proving the solvability of nonlinear functional equations in Banach spaces,” Math. Z.,122, No. 4, 355–362 (1971).

    Google Scholar 

  219. P. Hess, “Nonlinear functional equations in Banach spaces and homotopy arguments,” Bull. Am. Math. Soc.,77, No. 2, 211–215 (1971).

    Google Scholar 

  220. E. Hopf, “Ein allgemeiner Endlichkeitssatz der Hydrodynamik,” Math. Ann.,117, 764–775 (1940–1945).

    Google Scholar 

  221. E. Hopf, “Zum analytischen Charakter der Lösungen reguläres zwei dimensionaler Variationsprobleme,” Math. Z.,30, 404–413 (1929).

    Google Scholar 

  222. R. Kluge, “Fixpunktbifurkation für parameterabhängige vieldeutige vollstetige Abbildungen,” Monatsber. Dtsch. Acad. Wiss. Berlin,11, No. 2, 89–95 (1969).

    Google Scholar 

  223. M. Kucera, “Fredholm alternative for nonlinear operators,” Comm. Math. Univ. Carol.,11, No. 2, 337–363 (1970).

    Google Scholar 

  224. Kuo Hui-Hsiung, “The Morse-Palais lemma on Banach spaces,” Bull. Am. Math. Soc.,80, No. 2, 363–365 (1974).

    Google Scholar 

  225. O. A. Ladyzhenskaia and N. N. Ural'tseya, “On the smoothness of weak solutions of quasilinear equations in several variables and of variational problems,” Commun. Pure Appl. Math.,14, No. 3, 481–495 (1961).

    Google Scholar 

  226. A. Langenbach, “Über nichtlineare Gleichungen mit differenzierbaren Regularizatoren und Verzweigungs-probleme,” Math. Nachr.,34, Nos. 1–2, 1–18 (1967).

    Google Scholar 

  227. A. Langenbach, “Über Lösungsverzweigungen bei Potentialoperatoren,” Math. Nachr.,42, Nos. 1–3 (1969).

  228. L. Leray and J. L. Lions, “Quelques résultats de Visik sur les problemes elliptiques nonlineaires par les methodes de Minty-Browder,” Bull. Soc. Math. France,93, No. 1, 97–105 (1965).

    Google Scholar 

  229. L. Lichtenstein, “Über den analytischen Character der Lösungen zwei-dimensionaler Variationsprobleme,” Bull. Acad. Sci. Cracovie, Cl. Sci. Math. Nat. A., 915–941 (1912).

  230. J. L. Lions, “Quelques Methodes de Resolution des Problemes aux Limites non Lineaires, Dunod, Gauthier-Villars, Paris (1969).

    Google Scholar 

  231. A. Marino and G. Prodi, “La teoria di Morse per gli spazi di Hilbert. Un'applicazione ai problema della diramazione per operatori variazionali,” Rend. Semin. Mat. Univ. Padova,41, 43–68 (1968–1969).

    Google Scholar 

  232. G. J. Minty, “Monotone (nonlinear) operators in Hilbert space,” Duke Math. J.,29, No. 3, 341–346 (1962).

    Google Scholar 

  233. G. J. Minty, “On a ‘monotonicity’ method for the solution of nonlinear equations in Banach spaces,” Proc. Natl. Acad. Sci. USA,50, No. 6, 1038–1041 (1963).

    Google Scholar 

  234. G. J. Minty, “On the solvability of nonlinear functional equations of ‘monotonic’ type,” Pac. J. Math.,14, No. 1, 249–255 (1964).

    Google Scholar 

  235. C. B. Morrey, Jr., “Differentiability theorems for weak solutions of nonlinear elliptic differential equations,” Bull. Am. Math. Soc.,75, 684–705 (1964).

    Google Scholar 

  236. C. B. Morrey, Jr., Differentiability theorems for nonlinear elliptic equations,” Actes Congr. Int. Mathematiciens (1970), Vol. 2, Paris (1971), pp. 859–866.

    Google Scholar 

  237. C. B. Morrey, Jr., “Partial regularity results for nonlinear elliptic systems,” J. Math. Mech.,17, No. 7, 649–670 (1968).

    Google Scholar 

  238. C. B. Morrey, Jr., Multiple Integral Problems in the Calculus of Variations, Univ. Calif. Publ. (1943).

  239. C. B. Morrey, Jr., “On the solutions of quasilinear elliptic partial differential equations,” Trans. Am. Math. Soc.,43, 126–166 (1938).

    Google Scholar 

  240. C. B. Morrey, Jr., “Existence and differentiability theorems for variational problems with multiple integrals,” Univ. Wisconsin Press, Madison (1961), pp. 241–270.

    Google Scholar 

  241. M. Morse, The Calculus of Variations in the Large, New York (1934).

  242. J. Moser, “A new proof of de Giorgi's theorem concerning the regularity problem for elliptic differential equations,” Commun. Pure Appl. Math.,13, No. 3, 457–468 (1960).

    Google Scholar 

  243. M. Nagumo, “Degree of mapping in convex linear topological spaces,” Am. J. Math.,73, 491–511 (1951).

    Google Scholar 

  244. J. Naumann, “Lusternik-Schirelman Theorie und nichtlineare Eigenwertprobleme,” Math. Nachr.,53, Nos. 1–6, 303–336 (1972).

    Google Scholar 

  245. J. Nečas, “Sur la regularite des solutions faibles des equations elliptiques non lineaires,” Commun. Math. Univ. Carol.,9, No. 3, 365–413 (1968).

    Google Scholar 

  246. J. Nečas, “Sur une methode generale pour la solution des problemes aux limites non lineaires,” Ann. Scuola Norm. Super. Pisa, Sci. Fis. Mat.,20, No. 4, 655–674 (1966).

    Google Scholar 

  247. J. Necas, “Sur l'alternative de Fredholm pour les operateurs non-lineaires avec applications aux problemes aux limites,” Ann. Scuola Norm. Super. Pisa. Sci. Fis. Mat.,23, No. 2, 331–345 (1969).

    Google Scholar 

  248. J. Nečas, “On the existence and regularity of solutions of nonlinear elliptic equations,” Diff. Eqs. Appl., Equadiff., II, Bratislava (1967), pp. 101–119.

  249. J. Nečas, “On the demiregularity of weak solutions of nonlinear elliptic equations,” Bull. Am. Math. Soc.,77, No. 1, 151–156 (1971).

    Google Scholar 

  250. J. Nečas, “Sur l'existence de la solution reguliere pour le probleme de Dirichlet de l'equation elliptique non lineaire d'ordre 2k,” Atti Accad. Naz. Lincei. Rend. Cl. Sci. Fis., Mat. Natur.,42, No. 3, 347–354 (1967).

    Google Scholar 

  251. J. Nečas, “Fredholm alternative for nonlinear operators and applications to partial differential equations and integral equations,” Cas. Pestov. Mat.,97, No. 1, 65–71 (1972).

    Google Scholar 

  252. R. S. Palais, “The Morse lemma for Banach spaces,” Bull. Am. Math. Soc.,75, No. 5, 968–971 (1969).

    Google Scholar 

  253. R. S. Palais, Foundations of Global Nonlinear Analysis, New York-Amsterdam (1968).

  254. R. S. Palais, “Lusternik-Schnirelman theory of Banach manifolds,” Topology,5, No. 2, 115–132 (1966).

    Google Scholar 

  255. R. S. Palais, “Morse theory on Hilbert manifolds,” Topology,2, No. 4, 299–340 (1963).

    Google Scholar 

  256. R. S. Palais and S. Smale, “A generalized Morse theory,” Bull. Am. Math. Soc.,70, No. 1, 165–172 (1964).

    Google Scholar 

  257. W. V. Petryshyn, “Invariance of domain theorem for locally A-proper mappings and its applications,” J. Funct. Anal.,5, No. 1, 137–159 (1970).

    Google Scholar 

  258. W. V. Petryshyn, “Nonlinear equations involving noncompact operators,” Proc. Sympos. Pure Math., 1970, Vol. 18, pp. 1, 206–233.

    Google Scholar 

  259. W. V. Petryshyn, “On nonlinear equations involving pseudo-A-proper mappings and their uniform limits with applications,” J. Math. Anal. Appl.,38, No. 3, 672–720 (1972).

    Google Scholar 

  260. W. V. Petryshyn, “On the approximation-solvability of nonlinear equations,” Math. Ann.,177, No. 2, 156–164 (1968).

    Google Scholar 

  261. W. V. Petryshyn, “ On nonlinear P-compact operators in Banach space with applications to constructive fixed-point theorems,” J. Math. Anal. Appl.,15, No. 2, 228–242 (1966).

    Google Scholar 

  262. W. V. Petryshyn, “Fixed-point theorems involving P-compact, semicontractive, and accretive operators not defined on all of a Banach space,” J. Math. Anal. Appl.,23, No. 2, 336–354 (1968).

    Google Scholar 

  263. W. V. Petryshyn, “On a fixed-point theorem for nonlinear P-compact operators in Banach space,” Bull. Am. Math. Soc.,72, No. 2, 329–334 (1966).

    Google Scholar 

  264. W. V. Petryshyn, “Antipodes theorem for A-proper mappings and its applications to mappings of the modified type (S) or (S)+ and to mappings with the pm property,” J. Funct. Anal.,7, No. 1, 165–211 (1971).

    Google Scholar 

  265. W. V. Petryshyn, “Surjectivity theorems for odd maps of A-proper type,” Math. Ann.,192, No. 2, 155–172 (1971).

    Google Scholar 

  266. W. V. Petryshyn and T. S. Tucker, “On the functional equations involving nonlinear generalized P-compact operators,” Trans. Am. Math. Soc.,135, Jan., 343–373 (1969).

    Google Scholar 

  267. G. Prodi, “Problemi diramzione per equazioni funzionali,” Boll. Unione Mat. Ital.,22, No. 4, 413–433 (1967).

    Google Scholar 

  268. D. Sather, “Branching of solutions of a class of nonlinear equations,” Math. Z.,123, No. 2, 105–112 (1971).

    Google Scholar 

  269. D. H. Sattinger, “Topics instability and bifurcation theory,” Lect. Notes Math.,309 (1973).

  270. D. H. Sattinger, “Stability of bifurcating solutions by Leray-Schauder degree,” Arch. Rat. Mech. Anal.,43, No. 2, 154–166 (1971).

    Google Scholar 

  271. J. Schauder, “Invariants des Gebietes in Functionalraumen,” Stud. Math.,1, 123–139 (1929).

    Google Scholar 

  272. J. T. Schwartz, “Generalizing the Lusternik-Schnirelman theory of critical points,” Commun. Pure Appl. Math.,17, No. 3, 307–315 (1964).

    Google Scholar 

  273. S. Smale, “On the Morse index theorem,” J. Math. Mech.,14, No. 6, 1049–1055 (1965).

    Google Scholar 

  274. S. Smale, “An infinite-dimensional version of Sard's theorem,” Am. J. Math.,87, No. 4, 861–866 (1965).

    Google Scholar 

  275. S. Smale, “Morse theory and nonlinear generalization of the Dirichlet problem,” Ann. Math.,80, No. 2, 382–396 (1964).

    Google Scholar 

  276. J. Stara, “Regularity results for nonlinear elliptic systems in two dimensions,” Ann. Scuola Norm. Super. Pisa. Sci. Fis. Mat.,25, No. 1, 163–190 (1971).

    Google Scholar 

  277. A. J. Tromba, “The Morse lemma on Banach spaces,” Proc. Am. Math. Soc.,34, No. 2, 396–402 (1972).

    Google Scholar 

  278. A. J. Tromba, “The Morse lemma on arbitrary Banach spaces,” Bull. Am. Math. Soc.,79, No. 1, 85–86 (1973).

    Google Scholar 

  279. K. Uhlenbeck, “Morse theory on Banach manifolds,” Bull. Am. Math. Soc.,76, No. 1, 105–106 (1970).

    Google Scholar 

  280. K. Uhlenbeck, “Integrals with nondegenerate critical points,” Bull. Am. Math. Soc.,76, No. 1, 125–128 (1970).

    Google Scholar 

  281. K. Uhlenbeck, “The Morse index theorem in Hilbert space,” J. Diff. Geom.,8, No. 4, 555–564 (1973).

    Google Scholar 

  282. N. N. Uraltseva, “On the nonuniformly quasilinear elliptic equations,” Actes Congr. Int. Mathematiciens (1970), Vol. 2, Paris (1971), pp. 859–866.

    Google Scholar 

  283. Wolf von Wahl. “Über die Hölderstetigkeit der schwachen Lösungen gewisser semilinearer elliptischer Systeme,” Math. Z.,130, No. 2, 149–157 (1973).

    Google Scholar 

  284. K. O. Widman, “Local bounds for solutions of higher order nonlinear elliptic partial differential equations,” Math. Z.,121, No. 1, 81–95 (1971).

    Google Scholar 

  285. K. O. Widman, “Hölder continuity of solutions of elliptic systems,” Manuscr. Math.,5, No. 4, 299–308 (1971).

    Google Scholar 

  286. H. Ship-Fah Wong, “A product formula for the degree of A-proper maps,” J. Funct. Anal.,10, No. 3, 361–371 (1972).

    Google Scholar 

  287. H. Ship-Fah Wong, “The topological degree of A-proper maps,” Can. J. Math.,23, No. 3, 403–412 (1971).

    Google Scholar 

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Translated from Itogi Nauki i Tekhniki, Sovremennye Problemy Matematiki, Vol. 9, pp. 131–254, 1976.

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Skrypnik, I.V. Solvability and properties of solutions of nonlinear elliptic equations. J Math Sci 12, 555–629 (1979). https://doi.org/10.1007/BF01089138

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