Existence of solutions for first order singular problems

Cherpion, M.; De Coster, C.

doi:10.1090/S0002-9939-99-05515-X

Existence of solutions for first order singular problems
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by M. Cherpion and C. De Coster PDF

Proc. Amer. Math. Soc. 128 (2000), 1779-1791 Request permission

Abstract:

We develop the lower and upper solutions method for first order initial value problems as well as for first order periodic problems in case the nonlinearity presents singularities. More precisely we prove that if we have a lower solution $\alpha$ and an upper solution $\beta$ of these problems, which are not necessarily continuous nor ordered, we have a solution wedged between $\min \{\alpha ,\beta \}$ and $\max \{\alpha ,\beta \}$.

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