International Journal of Mathematics and Mathematical Sciences
Volume 2007 (2007), Article ID 65947, 14 pages
doi:10.1155/2007/65947

Nonlinear integrodifferential equations of mixed type in Banach spaces

Aneta Sikorska-Nowak1 and Grzegorz Nowak2

1Faculty of Mathematics and Computer Science, Adam Mickiewicz University, Poznań 61-614, Poland
 2University of Marketing and Management, Ostroroga 9a, Leszno 64-100, Poland

Abstract

We prove two existence theorems for the integrodifferential equation of mixed type: x'(t)=f(t,x(t),∫0tk1(t,s)g(s,x(s))ds,∫0ak2(t,s)h(s,x(s))ds), x(0)=x0, where in the first part of this paper f, g, h, x are functions with values in a Banach space E and integrals are taken in the sense of Henstock-Kurzweil (HK). In the second part f, g, h, x are weakly-weakly sequentially continuous functions and integrals are taken in the sense of Henstock-Kurzweil-Pettis (HKP) integral. Additionally, the functions f, g, h, x satisfy some conditions expressed in terms of the measure of noncompactness or the measure of weak noncompactness.