An Abstract Form of Maximum and Anti-maximum Principles of Hopf's Type
An Abstract Form of Maximum and Anti-maximum Principles of Hopf's Type
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Hopf型极大值与反极大值原理的抽象形式
DOI:
10.1006/jmaa.1996.0259
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发表时间:
1996
影响因子:
1.3
通讯作者:
P. Takáč
中科院分区:
文献类型:
--
作者:
P. Takáč
Abstract We consider an abstract linear elliptic boundary value problemAu−λu=−f≤0 in a strongly ordered Banach spaceX. The resolvent (λI−A)−1of the closed linear operatorA : X→Xis assumed to be strongly positive and compact for all λ>λ1, where λ1denotes the principal eigenvalue ofA. We prove that there exists a constant δ≡δ(f)>0 depending uponf∈X+\{0} such that −u=−(λI−A)−1f∈X+holds for all λ∈(λ1−δ, λ1). Here,X+={x∈X : x≥0} denotes the positive cone inXwith the topological interiorX+≠∅. We also present nearly sharp sufficient conditions forAguaranteeing independence of δ>0 fromf, i.e., −(λI−A)−1is strongly positive for all Λ∈(λ1−δ, λ1). In particular, for an elliptic Dirichlet boundary value problem, or for a strictly cooperative system of such problems, the strong maximum and boundary point principles (for λ>λ1) yield an anti-maximum principle of Hopf's type (for λ∈(λ1−δ, λ1) depending uponf): If 0≤f∈Lp(Ω), N R N, thenu 0 on ∂Ω whenever λ∈(λ1−δ, λ1).