SISSA Open Science

Browsing by Subject "elliptic operator; boundary value problems; Dirichlet and Neumann problem; lower and upper solutions; degree theory"

Browsing by Subject "elliptic operator; boundary value problems; Dirichlet and Neumann problem; lower and upper solutions; degree theory"

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  • Fonda, Alessandro; Klun, Giuliano; Sfecci, Andrea (SISSA, 2020-05)
    We prove existence results for systems of boundary value problems involving elliptic second order differential operators. The as-sumptions involve lower and upper solutions, which may be either well-ordered, or not at all. ...

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