Some remarks on a superlinear-singular problem: Estimates of λ∗λ∗

In this work we evaluate the extremal value of λλ related to positive solutions of nonlinear singular elliptic equations −Δu=h(x)u−γ+λW(x)up where WW is allowed to change sign, and obtain uniform lower bounds for λ∗(γ,p,h,W,Ω)λ∗(γ,p,h,W,Ω).