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A REMARK ON THE UNIQUENESS OF POSITIVESOLUTIONS TO SEMILINEAR ELLIPTIC EQUATIONSWITH DOUBLE-POWER NONLINEARITIES

机译:关于双线性椭圆型半椭圆型方程正解的唯一性

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摘要

We consider the uniqueness of positive solutions to Δu+f(u)= 0 in R~n,lim u(x) 0,|x|-∞ where f (u) = -ωu + u~p - u~(2p-1), with ω > 0 and p > 1.It is known that for fixed p > 1, a positive solution exists if and only if ω < ω_p:= p/(p+1)~2.We deduce the uniqueness in the case where w is close to ω_p, from the argument in the classical paper by Peletier and Serrin [9], thereby recovering a part of the uniqueness result of Ouyang and Shi [8] for all ω ∈ (0, ω_p).In the appendix we consider the more general nonlinearity f (u) = -ωu u~p - u~q, ω > 0, q > p > 1 and discuss the existence and uniqueness conditions. There we prove the fact that f having positive part is equivalent to f remaining negative, where f (u) := (uf'(u))'f (u) - uf'(u)~2.
机译:我们考虑R〜n,lim u(x)0,| x |-∞中Δu+ f(u)= 0的正解的唯一性,其中f(u)=-ωu+ u〜p-u〜(2p -1),其中ω> 0且p> 1.已知对于固定p> 1,当且仅当ω<ω_p:= p /(p + 1)〜2时,存在一个正解,我们得出唯一性。在w接近ω_p的情况下,根据Peletier和Serrin [9]在经典论文中的论证,从而针对所有ω∈(0,ω_p)恢复欧阳和石[8]的唯一性结果的一部分。在附录中,我们考虑更一般的非线性f(u)=-ωuu〜p-u〜q,ω> 0,q> p> 1,并讨论了存在性和唯一性条件。在那里我们证明了一个事实,即f具有正的部分等于f保持为负,其中f(u):=(uf'(u))'f(u)-uf'(u)〜2。

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