Geodesic
Remarks on the Existence of Many Solutions of Certain Nonlinear Elliptic Equations
Bollettino della Unione matematica italiana, Série 8, 10B (2007) no. 3, pp. 1013-1023.

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We show how a change of variable and peak solution methods can be used to prove that a number of nonlinear elliptic partial differential equations have many solutions.
In questo lavoro, si mostra come i cambi di variabile unitamente ai metodi utilizzati per trovare soluzioni ad uno o più picchi, possono essere usati per provare che varie equazioni alle derivate parziali non lineari hanno molte soluzioni. 
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Dancer, Edward N.; Yan, Shusen. Remarks on the Existence of Many Solutions of Certain Nonlinear Elliptic Equations. Bollettino della Unione matematica italiana, Série 8, 10B (2007) no. 3, pp. 1013-1023. http://geodesic.mathdoc.fr/item/BUMI_2007_8_10B_3_a37/

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