Abstract
General existence criteria are presented for nonlinear singular boundary value problems. Our nonlinearity may be singular in both the dependent and independent variable.
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Agarwal, R.P., O'Regan, D. Singular problems motivated from classical upper and lower solutions. Acta Mathematica Hungarica 100, 245–256 (2003). https://doi.org/10.1023/A:1025045626822
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DOI: https://doi.org/10.1023/A:1025045626822