... Academic Publishers, Dordrecht, 1997.72 Multivalued p-Lienard systems2. Mathematical backgroundIn this section, we recall some basic definitions and facts from multivalued analysis, thespectral ... ∈SqF(·,x(·),x(·)),henceN(x) =∅. MULTIVALUED p-LIENARD SYSTEMSMICHAEL E. FILIPPAKIS AND NIKOLAOS S. PAPAGEORGIOUReceived 7 October 2003 and in revised for m 9 March 2004We exami ne p-Lienard systems driven ... G(y).Remark 2.2. Evidently this is a multivalued version of the classical Leray-Schauder al-ternative principle [2, page 206]. In contrast to previous multivalued extensions of theLeray-Schauder...