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math.AP2017
Results of Ambrosetti-Prodi type for non-selfadjoint elliptic operators
Boyan Sirakov, Carlos Tomei, André Zaccur
The well-known Ambrosetti-Prodi theorem considers perturbations of the Dirichlet Laplacian by a nonlinear function whose derivative jumps over the principal eigenvalue of the opera…
math.AP2017★ 1 cited
Global folds between Banach spaces as perturbations
Marta Calanchi, Carlos Tomei, André Zaccur
Global folds between Banach spaces are obtained from a simple geometric construction: a Fredholm operator of index zero with one dimensional kernel is perturbed by a compatible…