# Π-SEMIGROUP FOR INVARIANT UNDER TRANSLATIONS TIME SCALES AND ABSTRACT WEIGHTED PSEUDO ALMOST PERIODIC FUNCTIONS WITH APPLICATIONS

 Title Π-SEMIGROUP FOR INVARIANT UNDER TRANSLATIONS TIME SCALES AND ABSTRACT WEIGHTED PSEUDO ALMOST PERIODIC FUNCTIONS WITH APPLICATIONS Publication Type Journal Article Year of Publication 2016 Authors WANG CHAO, AGARWAL RAVIP, O’REGAN DONAL Abstract In this paper, we introduce and discuss the concept of a Π-semigroup for invariant under translations time scales and the concept of abstract weighted pseudo almost periodic functions in Banach spaces. As an application, we obtain conditions for the existence of weighted pseudo almost periodic solutions for a class of neutral functional differential equations on time scales