Vol. 118, No. 2, 1985

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A theorem of J. L. Walsh, revisited

Alfred Sebastian Cavaretta, Jr., Ambikeshwar Sharma and Richard Steven Varga

Vol. 118 (1985), No. 2, 313–322
Abstract

The well-known and beautiful result of J. L. Walsh, on the overconvergence of sequences of differences of polynomials interpolating a function f(z) analytic in |z| < ρ (but having a singularity on |z| = ρ), where 1 < ρ < , has been recently extended in a new direction by T. J. Rivlin. We give here three new extensions of Rivlin’s result, which include Hermite and Birkhoff interpolation.

Mathematical Subject Classification 2000
Primary: 30E05
Milestones
Received: 5 March 1984
Published: 1 June 1985
Authors
Alfred Sebastian Cavaretta, Jr.
Ambikeshwar Sharma
Richard Steven Varga