I will discuss properties of action-minimizing measures for autonomous Lagrangian systems on the 2-torus of the form kinetic energy plus potential energy.Th
In this lecture,I shall give a brief survey on the studies about existence and multiplicity of closed geodesics on compact manifolds,including the new resul
We present some versions of strong maximum principles for singular solutions of elliptic,or degenerate,elliptic equations of second order.Some applications