Multiplicity of negative-energy solutions for singular-superlinear Schrödinger equations with indefinite-sign potential

Carlos Alberto Santos, Ricardo Alves Lima, Kaye Silva

We are concerned with the multiplicity of positive solutions for the singular superlinear and subcritical Schrödinger equation $$ \begin{array}{c} -Δu +V(x)u=λa(x)u^{-γ}+b(x)u^{p}~…