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Existence results for the problem $(\varphi(u'))'= f(t,u,u')$ with nonlinear boundary conditions. (English) Zbl 0920.34029
The authors prove an existence result for problems of the form $$(\phi(u'))'= f(t,u,u')\text{ a.e. }t\in [a,b],\ g(u(a), u'(a), u'(b))= 0,\ h(u(a))= u(b),$$ where $\phi$ is continuous and increasing from $\bbfR$ onto $\bbfR$. The main tools are the method of lower and upper solutions, the Nagumo condition and the Schauder fixed point theorem.

##### MSC:
 34B15 Nonlinear boundary value problems for ODE
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##### References:
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