Geodesic
Infinitely many solutions for a class of semilinear elliptic equations in $\mathbb{R}^N$
Bollettino della Unione matematica italiana, Série 8, 4B (2001) no. 2, pp. 311-317.

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Si considera una classe di equazioni ellittiche semilineari su $\mathbb{R}^{N}$ della forma $-\Delta u + u= a(x) |u|^{p-1}u$ con $p>1$ sottocritico (o con nonlinearità più generali) e $a(x)$ funzione limitata. In questo articolo viene presentato un risultato di genericità sull'esistenza di infinite soluzioni, rispetto alla classe di coefficienti $a(x)$ limitati su $\mathbb{R}^{N}$ e non negativi all'infinito. 
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Alessio, Francesca; Caldiroli, Paolo; Montecchiari, Piero. Infinitely many solutions for a class of semilinear elliptic equations in $\mathbb{R}^N$. Bollettino della Unione matematica italiana, Série 8, 4B (2001) no. 2, pp. 311-317. http://geodesic.mathdoc.fr/item/BUMI_2001_8_4B_2_a1/

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