A multiplicity result for p-Lapacian boundary value problems via critical points theorem

In this paper, we deal with the existence of at least three classical solutions for the following two point boundary value problem(φp(u′))′+λf(t,u)=0,α1u(a)-α2u′(a)=0,β1u(b)+β2u′(b)=0,where φp(s)=∣s∣p-2s, p>1 is a constant, λ is a positive parameter, a,b∈R,a