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On Neumann boundary value problems for some quasilinear elliptic equationsKeywords: p-Laplacian , positive solutions , Neumann boundary value problems. Abstract: function $a(x)$ on the existence of positive solutions to the problem $$left{ eqalign{ -{ m div},(|abla u|^{p-2}abla u)&= lambda a(x)|u|^{p-2}u+b(x)|u|^{gamma-2}u, quad xinOmega, cr x{partial u overpartial n}&=0, quad xinpartialOmega,,} ight. $$ where $Omega$ is a smooth bounded domain in $R^n$, $b$ changes sign, $1 Keywords p-Laplacian --- positive solutions --- Neumann boundary value problems.
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