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Upper and lower solutions for singular problems with nonlinear boundary data. (English) Zbl 1025.34019
Authors’ abstract: “We obtain via Schauder’s fixed-point theorem new results for singular boundary value problems when our nonlinear term \(f\) is allowed to change sign. Our boundary data include the Sturm-Liouville condition \(y(0)=y'(1)+ky(1)=0\), and the Stefan condition \(y(0)=y'(1)+ay^4(1)=0,a>0\)”.

MSC:
34B16 Singular nonlinear boundary value problems for ordinary differential equations
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