NCTS(South)/NCKU Math Colloquium
DATE	2009-10-29　16:10-17:00
PLACE	R204, 2F, NCTS, NCKU
SPEAKER	Prof. Tsung-fang Wu(吳宗芳教授)（國立高雄大學應用數學系）
TITLE	Multiple positive solutions of semilinear elliptic equations involving sign-changing weight functions
ABSTRACT	In this talk, we will consider the decomposition of the Neharimanifold via the combination of concave and convex nonlinearities.Furthermore, we use this result and the Ljusternik-Schnirelmann category toprove that the existences of multiple positive solutions for semilinearelliptic equations involving sign-changing weight functions.