Study of the algebra of smooth integro-differential operators with applications

Abstract

We study the algebra of integro-differential operators with smooth coefficients and kernels on a subspace of $C^{\infty }[a,b]$. We find a normal form for elements of this algebra and determine its unit group. The formulation of inverses gives explicit solutions of inhomogeneous linear Volterra integro-differential equations and Volterra integral equations of first kind with smooth kernels.