Geodesic
An existence and approximation theorem for solutions of degenerate nonlinear elliptic equations
Annales Universitatis Mariae Curie-Skłodowska. Mathematica, Tome 72 (2018) no. 1

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The main result establishes that a weak solution of degenerate nonlinear  elliptic equations can be approximated by a sequence of solutions for non-degenerate nonlinear elliptic equations.
Keywords: Degenerate nonlinear elliptic equations, weighted Sobolev spaces 
Cavalheiro, Albo Carlos. An existence and approximation theorem for solutions of degenerate nonlinear elliptic equations. Annales Universitatis Mariae Curie-Skłodowska. Mathematica, Tome 72 (2018) no. 1. http://geodesic.mathdoc.fr/item/AUM_2018_72_1_a0/
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