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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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