
Abstract We consider the equation - div ( a ( x ) ∇ u ) = b ( x ) | u | q - 2 u + c ( x ) | u | p - 2 u , u ∈ H 0 1 ( Ω ) , $-\operatorname{div}(a(x)\nabla u)=b(x)|u|^{q-2}u+c(x)|u|^{p-2}u,\quad u\in H_{% 0}^{1}(\Omega),$ where Ω ⊂ ℝ N ${\Omega\subset\mathbb{R}^{N}}$ is a bounded smooth domain and N ≥ 4 ${N\geq 4}$ . The functions a, b and c satisfy some hypotheses which provide a variational structure for the problem. For 1 < q < 2 < p ≤ 2 N / ( N - 2 ) ${1<q<2<p\leq 2N/(N-2)}$ we obtain the existence of two nonzero solutions if the function b has small Lebesgue norm. The proof is based on minimization arguments and the Mountain Pass Theorem.
critical equations, variational methods, Variational methods for elliptic systems, concave and convex nonlinearities
critical equations, variational methods, Variational methods for elliptic systems, concave and convex nonlinearities
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