Acta mathematica scientia, Series B >
BLOWING UP AND MULTIPLICITY OF SOLUTIONS FOR A FOURTH-ORDER EQUATION WITH CRITICAL NONLINEARITY
Received date: 2014-10-18
Revised date: 2014-04-08
Online published: 2015-11-01
In this paper, we consider the following nonlinear elliptic problem : △2u = |u|8/(n-4)u + μ|u|q-1u, in Ω, △u = u = 0 on ∂Ω, where Ω is a bounded and smooth domain in Rn, n ∈ {5, 6, 7}, μ is a parameter and q ∈[4/(n 4), (12 n)/(n 4)]. We study the solutions which concentrate around two points of Ω. We prove that the concentration speeds are the same order and the distances of the concentration points from each other and from the boundary are bounded. For Ω = (Ωa)a a smooth ringshaped open set, we establish the existence of positive solutions which concentrate at two points of Ω. Finally, we show that for μ > 0, large enough, the problem has at least many positive solutions as the LjusternikSchnirelman category of Ω.
Siwar AMMAR , Mokhles HAMMAMI . BLOWING UP AND MULTIPLICITY OF SOLUTIONS FOR A FOURTH-ORDER EQUATION WITH CRITICAL NONLINEARITY[J]. Acta mathematica scientia, Series B, 2015 , 35(6) : 1511 -1546 . DOI: 10.1016/S0252-9602(15)30072-2
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