Non-well-ordered lower and upper solutions for semilinear systems of PDEs

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Date
2020-05
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SISSA
Abstract
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. The results are stated in an abstract framework, and can be translated also for systems of parabolic type.
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