Geodesic
Remarks on positive solutions to a semilinear Neumann problem
Atti della Accademia nazionale dei Lincei. Rendiconti Lincei. Matematica e applicazioni, Série 9, Tome 5 (1994) no. 3, pp. 237-246.

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In this paper we study the influence of the domain topology on the multiplicity of solutions to a semilinear Neumann problem. In particular, we show that the number of positive solutions is stable under small perturbations of the domain.
In questo lavoro studiamo l'influenza della topologia del dominio sul numero delle soluzioni di un problema di Neumann semilineare. In particolare, mostriamo che il numero delle soluzioni positive è stabile per piccole perturbazioni del dominio. 
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Candela, Anna Maria; Lazzo, Monica. Remarks on positive solutions to a semilinear Neumann problem. Atti della Accademia nazionale dei Lincei. Rendiconti Lincei. Matematica e applicazioni, Série 9, Tome 5 (1994) no. 3, pp. 237-246. http://geodesic.mathdoc.fr/item/RLIN_1994_9_5_3_a4/

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