In this paper, some existence results are obtained for periodic and subharmonic solutions for a class of ordinary P-Laplacian systems by the minimax methods in critical point theory.

Existence of solution for nonlinear two-point boundary value problems with one-dimensional p-Laplacian operator;

Existence of three positive solutions in a multi-points boundary value problem of p-Laplacian operator with first-order derivative;

The existence of multiple positive solutions for higher order boundary value systems with p-Laplacian operator;

Existence of positive solutions for the p-Laplacian equation m-point boundary value problems with derivative;

Solvability of a certain p-Laplacian equation;

Eigenvalue problem of p-Laplacian equations in weighted Sobolev space

The existence of positive solution for a multi-point boundary value problem with p-Laplacian;

Existence of Solution for m-point Boundary Value Problems at Resonance with p-Laplacian Operator;

The Existence of Countably Many Positive Solutions for One-Dimensional p-Laplacian Operator;

Some existence and multiplicity results are obtained for solutions of p-Laplacian equations involving Hardy-Sobolev critical exponents and superlinear nonlinearity by the variational methods and analysis techniques.

The existence of periodic solutions for p-Laplacian equations with some deviating arguments is studied by using coincidence degree theory.