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Positive Eigenfunctions of a Schrödinger Operator
The paper considers the eigenvalue problem − Δ u − α u + λ g ( x ) u = 0 with u ∈ H 1 ( R N ) , u ≠ 0 , where ∞, λ ∈ and g x ≡ 0 on Ω ¯ , g ( …