Abstract
In this paper the authors study the Hammerstein generalized integral equation
where \(k:[0,1]^{2}\rightarrow {\mathbb {R}}\) are kernel functions, \(m\ge 1\), \(g:[0,1] \rightarrow [0,\infty )\), and \(f:[0,1]\times {\mathbb {R}}^{m+1} \rightarrow [0,\infty )\) is a \(L^{\infty }-\)Carathéodory function. The existence of solutions of integral equations has been studied in concrete and abstract cases, by different methods and techniques. However, in the existing literature, the nonlinearity depends only on the unknown function. This paper is one of a very few to consider equations having discontinuous nonlinearities that depend on the derivatives of the unknown function and having discontinuous kernels functions that have discontinuities in the partial derivatives with respect to their first variable. Our approach is based on the Krasnosel’skiĭ–Guo compression/expansion theorem on cones and it can be applied to boundary value problems of arbitrary order \(n>m\). The last two sections of the paper contain an application to a third order nonlinear boundary value problem and a concrete example.
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References
Agarwal, R.P., O’Regan, D., Wong, P.J.Y.: Constant-sign Solutions of Systems of Integral Equations. Springer, Cham (2013)
Amann, H.: Existence theorems for equations of Hammerstein type. Appl. Anal. 1, 385–397 (1972)
Aziz, W., Leiva, H., Merentes, N.: Solutions of Hammerstein equations in the space \(BV(I_{a}^{b})\). Quaest. Math. 37(3), 359–370 (2014)
Benmzemai, A., Graef, J.R., Kong, L.: Positive solutions for abstract Hammerstein equations and applications. Commun. Math. Anal. 16, 47–65 (2014)
Brezis, H., Browder, F.: Existence theorems for nonlinear integral equations of Hammerstein type. Bull. AMS 81, 73–78 (1975)
Cabada, A., Infante, G., Tojo, F.A.F.: Nonzero solutions of perturbed Hammerstein integral equations with deviated arguments and applications. Topol. Methods Nonlinear Anal. (2016, to appear)
Cabada, A., Infante, G., Tojo, F.A.F.: Nontrivial solutions of perturbed Hammerstein integral equations with reflections. Bound. Value Probl. 2013, 86 (2013)
Cheng, X., Zhang, Z.: Existence of positive solutions to systems of nonlinear integral or differential equations. Topol. Methods Nonlinear Anal. 34, 267–277 (2009)
Chidume, C.E., Chidume, C.O., Minjibir, M.: A new method for proving existence theorems for abstract Hammerstein equations. Abstr. Appl. Anal. 2015, Art. ID 627260
Chidume, C.E., Shehu, Y.: Iterative approximation of solutions of generalized equations of Hammerstein type. Fixed Point Theory 15, 427–440 (2014)
Franco, D., Infante, G., O’Regan, D.: Nontrivial solutions in abstract cones for Hammerstein integral systems. Dyn. Contin. Discrete Impuls. Syst. Ser. A Math. Anal. 14, 837–850 (2007)
Guo, D., Lakshmikantham, V.: Nonlinear Problems in Abstract Cones. Academic Press, Boston (1988)
Hammerstein, A.: Nichtlineare Integralgleichungen nebst Anwendungen. Acta Math. 54, 117–176 (1930)
Henderson, J., Luca, R.: Positive solutions for systems of second-order integral boundary value problems. Electron. J. Qual. Theory Differ. Equ. 70, 21 (2013)
Infante, G., Pietramala, P.: Existence and multiplicity of non-negative solutions for systems of perturbed Hammerstein integral equations. Nonlinear Anal. 71, 1301–1310 (2009)
Infante, G., Webb, J.R.L.: Nonzero solutions of Hammerstein integral equations with discontinuous kernels. J. Math. Anal. Appl. 272, 30–42 (2002)
Krasnosel’skii, M.A.: Positive Solutions of Operator Equations. Noordhoff, Groningen (1964)
Lan, K.Q.: Multiple positive solutions of Hammerstein integral equations with singularities. Differ. Equ. Dyn. Syst. 8, 175–195 (2000)
Lan, K.Q., Lin, W.: Positive solutions of systems of singular Hammerstein integral equations with applications to semilinear elliptic equations in annuli. Nonlinear Anal. 74, 7184–7197 (2011)
Lan, K.Q., Lin, W.: Multiple positive solutions of systems of Hammerstein integral equations with applications to fractional differential equations. J. Lond. Math. Soc. 83, 449–469 (2011)
Li-Jun, G., Jian-Ping, S., Ya-Hong, Z.: Existence of positive solutions for nonlinear third-order three-point boundary value problems. Nonlinear Anal. 68, 3151–3158 (2008)
Minhós, F., de Sousa, R.: On the solvability of third-order three point systems of differential equations with dependence on the first derivative (2016, to appear)
Precup, R.: Componentwise compression-expansion conditions for systems of nonlinear operator equations and applications. In: Mathematical Models in Engineering, Biology and Medicine, pp. 284–293, AIP Conf. Proc., vol. 1124. Amer. Inst. Phys., Melville (2009)
Yang, Z.: Positive solutions for a system of nonlinear Hammerstein integral equations and applications. Appl. Math. Comput. 218, 11138–11150 (2012)
Yang, Z., O’Regan, D.: Positive solvability of systems of nonlinear Hammerstein integral equations. J. Math. Anal. Appl. 311, 600–614 (2005)
Yang, Z., Zhang, Z.: Positive solutions for a system of nonlinear singular Hammerstein integral equations via nonnegative matrices and applications. Positivity 16, 783–800 (2012)
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F. Minhós was supported by National Founds through FCT-Fundação para a Ciência e a Tecnologia, project SFRH/BSAB/114246/2016.
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Graef, J., Kong, L. & Minhós, F. Generalized Hammerstein Equations and Applications. Results Math 72, 369–383 (2017). https://doi.org/10.1007/s00025-016-0615-y
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DOI: https://doi.org/10.1007/s00025-016-0615-y