Directory UMM :Journals:Journal_of_mathematics:EJQTDE:
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AND M ATZEU M., Existence and multiplicity results for periodic solutions of superquadratic Hamiltonian systems where the potential changes sign, Nonlinear Differential Equations
Li, Positive solutions of second order boundary value problems with sign changing nonlinear term, J.. Li, On the existence and nonexistence of positive solutions for
Raffoul, Existence of periodic and positive peri- odic solutions in totally nonlinear delay differential equations (preprint).
Zhang The existence of countably many positive solutions for nonlinear singular m − point boundary value problems on the half line, J.. Wang, The existence of multiple
In [16], by using the fixed point theorem in a cone, we studied the existence of positive solutions of boundary value problem for systems of second-order differential equations
Zhang, The existence of countably many positive solutions for nonlinear singular m- point boundary value problems on time scales, J. Zhang, The existence of three positive solutions
The existence of nontrivial or positive solutions of nonlinear multi-point boundary value problems (BVP, for short) for fourth order differential equations has been extensively
That is, some authors have used fixed point theorems to show the existence of pos- itive solutions to boundary value problems for ordinary differential equations, difference
