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It is shown that known solvability conditions and several new existence results for semilinear elliptic boundary value problems at resonance can be considered from a unified point of view. The proofs apply Leray–Schauder degree arguments. 1991 Mathematics Subject Classification 35J65, 47H11, 47H15.
Bulletin of the London Mathematical Society – Wiley
Published: Jul 1, 1999
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