Abstract

We are concerned with the uniqueness of single-peaked solutions to the following problem −ε2△u+u=Q(x)up−1,inΩ,u>0,inΩ,u=0,on∂Ω,where ε>0 is a small parameter, and N≥3, 2<p<2N∕(N−2). By local Pohozaev identity and blow-up analysis, we show the uniqueness of single-peaked solutions under certain assumptions on asymptotic behavior of Q(x) and its first derivatives near the critical point. Here the degeneracy of the critical point is also allowed, which gives a partial answer to the question proposed in Cao et al. (1998).

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