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Acta Mathematica Vietnamica

ON ANALYSIS AND DISCRETIZATION OF NONLINEAR ABEL INTEGRAL EQUATIONS OF FIRST KIND

RUDOLF GORENFLO, ANDREAS PFEIFFER

Abstract

For 0xB, 0<β<1, we consider the integral equation 0x(xt)βK(x,t,y(y))dt=f(x) under appropriate Lipschitz-like conditions on the function K and some of its derivatives, the most essential condition being Ku(x,t,u)c>0 for 0txB, uR. After a survey on theorems of existence, uniqueness and stability of the solution we generalize a numerical method, proposed and investigated 1976 by H. W. Branca for the particular case β=1/2, to all β(0,1) and show it to be O(h2) convergent for all β[0.2118,1) if the solution y is sufficiently smooth. The method is based on piecewise linear interpolation, one-point weighted Gauss quadrature on parition intervals of equal lenght h, and collocation.