The best constant of Sobolev inequality corresponding to clamped boundary value problem.
The existence of a solution of a nonlinear boundary value problem
The existence of countably many positive solutions for nonlinear th-order three-point boundary value problems.
The method of upper and lower solutions for second-order non-homogeneous two-point boundary-value problem.
Third-order nonlocal problems with sign-changing nonlinearity on time scales.
Three symmetric positive solutions for Lidstone problems by a generalization of the Leggett-Williams theorem.
Triple positive solutions for second-order four-point boundary value problem with sign changing nonlinearities.
Two-point boundary value problems for second order systems