Abstract
In 1961, Baker, Gammel, and Wills formulated their famous conjecture that if a function f is meromorphic in the unit ball and analytic at 0, then a subsequence of its diagonal Padé approximants converges uniformly in compact subsets to f. This conjecture was disproved in 2001, but it generated a number of related unresolved conjectures. We review their status.
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References
Amiran, A., Wallin, H.: Padé-Type Approximants of Markov and Meromorphic Functions. J. Approx. Theory 88, 354–369 (1997)
Aptekarev, A., Yattselev, M.: Padé Approximants for functions with branch points - strong asymptotics of Nuttall-Stahl polynomials, manuscript.
Arms, R.J., Edrei, A.: The Padé tables and continued fractions generated by totally positive sequences, (in) mathematical essays. In: Shankar, H. (ed.) pp. 1–21. Ohio University Press, Athens, Ohio (1970)
Baker, G.A., Gammel, J.L., Wills, J.G.: An investigation of the applicability of the Padé approximant method. J. Math. Anal. Appl. 2, 405–418 (1961)
Baker, G.A., Graves-Morris, P.R.: Padé Approximants. Encyclopaedia of Mathematics and its Applications, vol. 59, 2nd edn., Cambridge University Press, Cambridge (1996)
Baker, G.A.: Essentials of Padé Approximants, Academic Press, New York (1975)
Baker, G.A. Jr.: Some structural properties of two counter-examples to the Baker-Gammel-Wills conjecture. J. Comput. Appl. Math. 161, 371–391 (2003)
Baker, G.A. Jr.: Counter-examples to the Baker-Gammel-Wills conjecture and patchwork convergence. J. Comput. Appl. Math. 179(1–2), 1–14 (2005)
Baratchart, L., Yattselev, M.: Asymptotics of Padé approximants to a certain class of elliptic–type functions (to appear in J. Anal. Math.)
Brezinski, C.: A History of Continued Fractions and Padé Approximants, Springer, Berlin (1991)
Buslaev, V.I.: Simple counterexample to the Baker-Gammel-Wills conjecture. East J. Approximations 4, 515–517 (2001)
Buslaev, V.I.: The Baker-Gammel-Wills conjecture in the theory of Padé approximants. Math. USSR. Sbornik 193, 811–823 (2002)
Buslaev, V.I.: Convergence of the Rogers-Ramanujan continued fraction. Math. USSR. Sbornik 194 833–856 (2003)
Buslaev, V.I., Goncar, A.A., Suetin, S.P.: On Convergence of subsequences of the mth row of a Padé table. Math. USSR Sbornik 48, 535–540 (1984)
Derevyagin, M., Derkach, V.: On the convergence of Padé approximants of generalized Nevanlinna functions. Trans. Moscow. Math. Soc. 68, 119–162 (2007)
Derevyagin, M., Derkach, V.: Convergence of diagonal Padé approximants for a class of definitizable functions, (in) Recent Advances in Operator Theory in Hilbert and Krein spaces. Operator Theory: Adv. Appl. 198 97–124 (2010)
Driver, K.A.: Convergence of Padé Approximants for some q-Hypergeometric Series (Wynn’s Power Series I, II, III), Thesis, University of the Witwatersrand (1991)
Driver, K.A., Lubinsky, D.S.: Convergence of Padé Approximants for Wynn’s Power Series II, Colloquia Mathematica Societatis Janos Bolyai, vol. 58, pp. 221–239. Janos Bolyai Math Society (1990)
Driver, K.A., Lubinsky, D.S.: Convergence of Padé Approximants for a q-Hypergeometric Series (Wynn’s Power Series I). Aequationes Mathematicae 42, 85–106 (1991)
Driver, K.A., Lubinsky, D.S.: Convergence of Padé Approximants for Wynn’s Power Series III. Aequationes Mathematicae 45, 1–23 (1993)
Dumas, S.: Sur le développement des fonctions elliptiques en fractions continues, Ph.D. Thesis, Zurich (1908)
Goncar, A.A.: On Uniform Convergence of Diagonal Padé Approximants. Math. USSR Sbornik 46, 539–559 (1983)
Goncar, A.A., Lungu, K.N.: Poles of Diagonal Padé Approximants and the Analytic Continuation of Functions. 39, 255–266 (1981)
Goncar, A.A., Rakhmanov, E.A., Suetin, S.P.: On the Convergence of Pade Approximations of Orthogonal Expansions. Proc. Steklov Inst. Math. 2, 149–159 (1993)
Landkof, N.S.: Foundations of Modern Potential Theory, Springer, Berlin (1972)
Levin, E.: The distribution of poles of rational functions of best approximation and related questions. Math. USSR Sbornik 9, 267–274 (1969)
Levin, E.: The distribution of the poles of the best approximating rational functions and the analytical properties of the approximated function. Israel J. Math. 24, 139–144 (1976)
Lopez Lagomasino, G.: Convergence of Padé approximants of Stieltjes type meromorphic functions and comparative asymptotics for orthogonal polynomials. Math. USSR Sbornik 64, 207–227 (1989)
Lubinsky, D.S.: Diagonal Padé Approximants and Capacity. J. Math. Anal. Applns. 78, 58–67 (1980)
Lubinsky, D.S.: Padé Tables of a Class of Entire Functions. Proc. Amer. Math. Soc. 94, 399–405 (1985)
Lubinsky, D.S.: Padé tables of Entire Functions of very Slow and Smooth Growth II. Constr. Approx. 4, 321–339 (1988)
Lubinsky, D.S.: On uniform convergence of rational, Newton-Padé interpolants of type (n, n) with free poles as n → ∞. Numer. Math. 55, 247–264 (1989)
Lubinsky, D.S.: Convergence of Diagonal Padé Approximants for Functions Analytic near 0. Trans. Amer. Math. Soc. 723, 3149–3157 (1995)
Lubinsky, D.S.: On the diagonal Padé approximants of meromorphic functions. Indagationes Mathematicae 7, 97–110 (1996)
Lubinsky, D.S.: Diagonal Padé Sequences for functions meromorphic in the unit ball approximate well near 0, in trends in approximation theory. In: Kopotun, K., Lyche, T., Neamtu, M. (eds.) pp. 297–305. Vanderbilt University Press, Nashville (2001)
Lubinsky, D.S.: Rogers -Ramanujan and the Baker-Gammel-Wills (Padé) Conjecture. Ann. Math. 157, 847–889 (2003)
Lubinsky, D.S.: Weighted maximum over minimum modulus of polynomials, applied to Ray Sequences of Padé Approximants. Constr. Approx. 18, 285–308 (2002)
Lubinsky, D.S., Saff, E.B.: Convergence of Padé approximants of partial theta functions and the Rogers-Szegö polynomials. Constr. Approx. 3, 331–361 (1987)
Martinez-Finkelshtein, A., Rakhmanov, E.A., Suetin, S.P.: Heine, Hilbert, Padé, Riemann, and Stieltjes: John Nuttall’s work 25 years later. Contemporary Math. 578, 165–193 (2012)
Nuttall, J.: The convergence of Padé Approximants of Meromorphic Functions. J. Math. Anal. Applns. 31, 147–153 (1970)
Nuttall, J., Singh, S.R.: Orthogonal Polynomials and Padé Approximants associated with a system of arcs. Constr. Approx. 2, 59–77 (1986)
Pommerenke, Ch.: Padé Approximants and Convergence in Capacity. J. Math. Anal. Applns. 41, 775–780 (1973)
Rakhmanov, E.A.: Convergence of diagonal Padé approximants. Math. USSR Sbornik 33, 243–260 (1977)
Rakhmanov, E.A.: On the Convergence of Padé Approximants in Classes of Holomorphic Functions. Math. USSR Sbornik 40, 149–155 (1981)
Ransford, T.: Potential Theory in the Complex Plane, Cambridge University Press, Cambridge (1995)
Saff, E.B., Totik, V.: Logarithmic Potential with External Fields, Springer, Berlin (1997)
Stahl, H.: Extremal domains associated with an analytic function. I, II. Complex Variables Theory Appl. 4, 311–324, 325–338 (1985)
Stahl, H.: The structure of extremal domains associated with an analytic function. Complex Variables Theory Appl. 4(4), 339–354 (1985)
Stahl, H.: General convergence results for Padé approximants, (in) Approximation theory VI. In: Chui, C.K., Schumaker, L.L., Ward, J.D. (eds.) pp. 605–634. Academic Press, San Diego (1989)
Stahl, H.: Diagonal Padé Approximants to hyperelliptic functions. Ann. Fac. Sci. Toulouse, Special Issue, 6, 121–193 (1996)
Stahl, H.: Conjectures around the Baker-Gammel-Wills conjecture: research problems 97–2. Constr. Approx. 13, 287–292 (1997)
Stahl, H.: The convergence of Padé approximants to functions with branch points. J. Approx. Theory 91, 139–204 (1997)
Suetin, S.P.: On the uniform convergence of diagonal Padé approximants for hyperelliptic functions. Math. Sbornik 191, 81–114 (2000)
Suetin, S.P.: Padé Approximants and the effective analytic continuation of a power series. Russian Math. Surveys 57, 43–141 (2002)
Wallin, H.: The convergence of Padé approximants and the size of the power series coefficients. Applicable Anal. 4, 235–251 (1974)
Wallin, H.: Potential theory and approximation of analytic functions by rational interpolation. In: Proceedings of Colloquium on Complex Analysis, Joensuu, Finland, 1978, Springer Lecture Notes in Mathematics, Vol. 747, pp. 434–450. Springer, Berlin (1979)
Wynn, P.: A General system of orthogonal polynomials. Quart. J. Math. Oxford Ser. 18, 81–96 (1967)
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Research supported by NSF grant DMS1001182 and US-Israel BSF grant 2008399.
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Dedicated to Professor Hari M. Srivastava
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Lubinsky, D.S. (2014). Reflections on the Baker–Gammel–Wills (Padé) Conjecture. In: Milovanović, G., Rassias, M. (eds) Analytic Number Theory, Approximation Theory, and Special Functions. Springer, New York, NY. https://doi.org/10.1007/978-1-4939-0258-3_21
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