Existence and multiplicity of positive weak solutions for a new class of (P; Q)-Laplacian systems

[摘要] The paper is concerned with the existence of positive weak solutions for a new class of $\left( p,q\right) $% -Laplacian elliptic systems in a bounded domain by means of the method of sub-super solutions. Particularly, we do not need any sign conditions for $% \gamma \left( 0\right), g\left( 0\right), f\left( 0\right) $ and $h\left( 0\right) $. Moreover, a multiplicity result is obtained when $\gamma \left( 0\right)=g\left( 0\right)=f\left( 0\right)=h\left( 0\right)=0.$ Finally, we give some examples to verify our main results.

[学科分类] 数学（综合）

[关键词] new elliptic systems existence;positive solutions;multiplicity;sub-super solutions