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Positive solutions to classes of infinite semipositone (p,q)-Laplace problems with nonlinear boundary conditions
Journal of Mathematical Analysis and Applications ( IF 1.3 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.jmaa.2020.124577
Inbo Sim , Byungjae Son

Abstract We consider one-dimensional ( p , q ) -Laplace problems: { − ( φ ( u ′ ) ) ′ = λ h ( t ) f ( u ) , t ∈ ( 0 , 1 ) , u ( 0 ) = 0 = a u ′ ( 1 ) + g ( λ , u ( 1 ) ) u ( 1 ) , where λ > 0 , a ≥ 0 , φ ( s ) : = | s | p − 2 s + | s | q − 2 s , 1 p q ∞ , h ∈ C ( ( 0 , 1 ) , ( 0 , ∞ ) ) , f ∈ C ( ( 0 , ∞ ) , R ) with lim s → 0 + ⁡ f ( s ) ∈ ( − ∞ , 0 ) ∪ { − ∞ } , and g ∈ C ( ( 0 , ∞ ) × [ 0 , ∞ ) , ( 0 , ∞ ) ) such that g ( r , s ) s is nondecreasing with respect to s ∈ [ 0 , ∞ ) . Classifying the behaviors of f near infinity, we establish the existence, multiplicity and nonexistence of positive solutions. In particular, we provide a sufficient condition on f to obtain a multiplicity result for the case when lim s → ∞ ⁡ f ( s ) s r − 1 ∈ ( 0 , ∞ ) , 1 r q , which is new even in semilinear problems ( p = q = 2 ). The proofs are based on a Krasnoselskii type fixed point theorem which is fit to overcome a lack of homogeneity.

中文翻译:

具有非线性边界条件的无限半正酮 (p,q)-拉普拉斯问题的正解

摘要 我们考虑一维 ( p , q ) -Laplace 问题: { − ( φ ( u ′ ) ) ′ = λ h ( t ) f ( u ) , t ∈ ( 0 , 1 ) , u ( 0 ) = 0 = au ′ ( 1 ) + g ( λ , u ( 1 ) ) u ( 1 ) , 其中 λ > 0 , a ≥ 0 , φ ( s ) : = | | p − 2 s + | | q − 2 s , 1 pq ∞ , h ∈ C ( ( 0 , 1 ) , ( 0 , ∞ ) ) , f ∈ C ( ( 0 , ∞ ) , R ) 与 lim s → 0 + ⁡ f ( s ) ∈ ( − ∞ , 0 ) ∪ { − ∞ } ,并且 g ∈ C ( ( 0 , ∞ ) × [ 0 , ∞ ) , ( 0 , ∞ ) ) 使得 g ( r , s ) s 相对于 s 不减∈ [ 0 , ∞ ) 。对 f 接近无穷大的行为进行分类,我们建立了正解的存在性、多重性和不存在性。特别地,我们在 f 上提供了一个充分条件,以在 lim s → ∞ ⁡ f ( s ) sr − 1 ∈ ( 0 , ∞ ) , 1 rq 的情况下获得多重性结果,即使在半线性问题 ( p = q = 2)。
更新日期:2021-02-01
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