We investigate the problem with perturbed periodic boundary values $$\left\}\begin{array}{c}{y}^{\text{'}\text{'}\text{'}}\left(x\right)+a_2\left(x\right)y^{\text{'}\text{'}}\left(x\right)+a_1\left(x\right)y^{\text{'}}\left(x\right)+a_0\left(x\right)y\left(x\right)=f\left(x\right),y^{\left(i\right)}\left(T\right)=c{y}^{\left(i\right)}\left(0\right),i=0,1,2;0<c<1\hfill \end{array}\right.$$ with $a_2,a_1,a_0\in C[0,T]$ for some arbitrary positive real number $T$, by transforming the problem into an integral equation with the aid of a piecewise polynomial and utilizing the Fredholm alternative theorem to obtain a condition on the uniform norms of the coefficients $a_2$, $a_1$ and $a_0$ which guarantees unique solvability of the problem. Besides having theoretical value, this problem has also important applications since decay is a phenomenon...

In this paper we establish the existence of nontrivial solutions to $$\frac{\mathrm{d}}{\mathrm{d}t}{L}_{x^{\text{'}}}(t,x^{\text{'}}\left(t\right))+V_x(t,x\left(t\right))=0,x\left(0\right)=0=x\left(T\right),$$ with $V_x$ superlinear in $x$.

In this paper, we deal with the existence of periodic solutions of the $p\left(t\right)$-Laplacian Hamiltonian system $$\left\{\begin{array}{c}{\displaystyle \frac{\mathrm{d}}{\mathrm{d}t}}\left(\right|\dot{u}\left(t\right){|}^{p\left(t\right)-2}\dot{u}\left(t\right))=\nabla F(t,u\left(t\right))\text{a.e.}t\in [0,T],\hfill \\ u\left(0\right)-u\left(T\right)=\dot{u}\left(0\right)-\dot{u}\left(T\right)=0.\hfill \end{array}\right.$$ Some new existence theorems are obtained by using the least action principle and minimax methods in critical point theory, and our results generalize and improve some existence theorems.