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首页> 外文期刊>Communications in Partial Differential Equations >Positive solutions to semilinear elliptic equations with logistic type nonlinearities and constant yield harvesting in R-N
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Positive solutions to semilinear elliptic equations with logistic type nonlinearities and constant yield harvesting in R-N

机译:R-N中具有逻辑类型非线性和恒定产量收获的半线性椭圆方程的正解

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摘要

We consider a class of semilinear elliptic equations -Delta u=f(x, u) in all of R-N with nonlinearities of the form f(x,u) = a(x)(lambda u-g(u)) -mu h(x), where lambda,mu are positive parameters, a(x), h(x) are positive functions, and g(u) is a super-linearly increasing function in a more general fashion than the classical logistic term u(2). From a practical point of view, these problems can provide models for fishery or hunting management (cf. [8]) where mu h(x) denotes a harvesting term and, as such, one is interested in situations allowing the existence of positive solutions. From a mathematical point of view, these elliptic problems belong to the class of so-called semi-positone problems (cf. [2]) because the nonlinearity f(x, u) satisfies f(x, 0) < 0. Under suitable assumptions on a(x), h(x), we use variational methods to show that, for each lambda > lambda(1) (a) (where lambda(1) (a) denotes the principal eigenvalue of -Delta u = lambda a(x)u is an element of D-1,D-2(R-N)), there exists a positive solution decaying at infinity like O(vertical bar x vertical bar(-(N-2))), provided that 0 < mu < (mu) over cap(lambda).
机译:我们考虑所有RN中的一类半线性椭圆方程-Delta u = f(x,u),其非线性形式为f(x,u)= a(x)(λug(u))-mu h(x ),其中lambda,mu是正参数,a(x),h(x)是正函数,而g(u)是超线性增加的函数,比经典逻辑项u(2)更通用。从实际的角度来看,这些问题可以为渔业或狩猎管理提供模型(参见[8]),其中mu h(x)表示收获期,因此,人们对允许存在正解的情况感兴趣。从数学的角度来看,这些椭圆问题属于所谓的半正问题(参见[2]),因为非线性f(x,u)满足f(x,0)<0。关于a(x),h(x)的假设,我们使用变分方法表明,对于每个lambda> lambda(1)(a)(其中lambda(1)(a)表示-Delta u = lambda的主要特征值) a(x)u是D-1,D-2(RN))的元素,存在一个像O(垂直条x垂直条(-(N-2)))一样在无穷大处衰减的正解,条件是0

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