# On the Solution of an Integral-Functional Equation with a Parameter

### Lothar Berg

Universität Rostock, Germany### Manfred Krüppel

Universität Rostock, Germany

## Abstract

For a homogeneous integral-functional equation containing a parameter, we show existence and uniqueness of a compactly supported solution with given value for its integral. The solution is infinitely often differentiable, symmetric with respect to the point 1/2, monotonous at both sides of 1/2 and satisfies further functional equations. The Fourier series of the periodic continuation is determined. We also investigate spectral properties of the integral equation and find surprising connections between the Laplace transform of the eigenfunction and the eigenfunctions of the adjoint equation, and also directly between different eigenfunc-tions both in the compact and in the non-compact case. Moreover, asymptotic considerations are made.

## Cite this article

Lothar Berg, Manfred Krüppel, On the Solution of an Integral-Functional Equation with a Parameter. Z. Anal. Anwend. 17 (1998), no. 1, pp. 159–181

DOI 10.4171/ZAA/814