Integral Inclusions

  • Donal O’Regan
  • Maria Meehan
Chapter
Part of the Mathematics and Its Applications book series (MAIA, volume 445)

Abstract

This chapter studies integral inclusions in Banach spaces. In particular we discuss the Volterra integral inclusion
$$ y(t){\rm{ }} \in {\rm{ g(t) + }}\smallint _0^t k(t,s){\rm{ F(s,y(s))ds for t }} \in {\rm{ [0,T]}} $$
(8.1.1)
and the Hammerstein integral inclusion
$$ y(t){\rm{ }} \in {\rm{ g(t) + }}\smallint _0^T k(t,s){\rm{ F(s,y(s))ds for t }} \in {\rm{ [0,T]}} $$
(8.1.2)
Here F : [0, T] × EE is a multivalued map with nonempty compact values; E is a real Banach space. In section 8.2 we present some existence results for (8.1.1) and (8.1.2) when F is a Carathéodory multifunction of u.s.c. or l.s.c. type satisfying some measure of noncompactness assumption. The theory of differential inclusions, usually when dim E < ∞, has received a lot of attention over the last twenty years or so. In this chapter a mixture of old and new ideas are presented so that a general existence theory for multivalued equations can be obtained. The ideas in this chapter were adapted from Deimling [4], Frigon [6] and O’Regan [13]. In particular the technique used in this chapter relies on Ky Fan’s or Schauder’s Fixed Point Theorem [16] together with a trick introduced in [9] and a result of Fitzpatrick and Petryshyn [5].

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Copyright information

© Springer Science+Business Media Dordrecht 1998

Authors and Affiliations

  • Donal O’Regan
    • 1
  • Maria Meehan
    • 1
  1. 1.Department of MathematicsNational University of IrelandGalwayIreland

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