Ravi P. Agarwal, Donal O'Regan, V. Lakshmikantham, "Existence criteria for singular initial value problems with sign changing nonlinearities", Mathematical Problems in Engineering, vol. 7, Article ID 285907, 22 pages, 2001. https://doi.org/10.1155/S1024123X01001752
Existence criteria for singular initial value problems with sign changing nonlinearities
A general existence theory is presented for initial value problems where our nonlinearity may be singular in its dependent variable and may also change sign.
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