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Necessary conditions for the existence of positive solutions of second-order linear difference equations and sufficient conditions for the oscillation of solutionsR. Koplatadze; G. Kvinikadze · 2009
On the existence of positive solutions for nonlinear differential equations with periodic boundary conditionsF.Merdivenci Atici; G.Sh. Guseinov · 2001
Necessary and Sufficient Conditions for the Existence of a Positive Definite Solution for the Matrix EquationEl-Shazly, Naglaa M. · Journal of Applied Mathematics · 2013
Necessary conditions for the existence of positive solutions to fractional boundary value problems at resonanceWang, Yongqing · Applied Mathematics Letters · 2019
On the existence of positive solutions for semilinear elliptic equations with Neumann boundary conditionsZ. Q. Chen; R. J. Williams; Z. Zhao · Probability Theory and Related Fields · 1995
Sharp conditions for the existence of positive solutions for a second-order singular impulsive differential equationZhang, Xuemei; Tian, Yafang · Applicable Analysis · 2017
Necessary and sufficient conditions for the existence of symmetric positive solutions of singular boundary value problemsJohn R. Graef; Lingju Kong · 2007
The existence of positive solutions for some nonlinear boundary value problems with linear mixed boundary conditionsBaofang Liu; Jihui Zhang · 2005