Titlebook: Critical Point Theory; Sandwich and Linking Martin Schechter Book 2020 The Editor(s) (if applicable) and The Author(s), under exclusive lic

peak-flow

咽下

Permanent

CON

Second Order Hamiltonian Systems,We consider the system . where . is a map from . = [0, .] to . such that each component ..(.) is a periodic function in .. with period ., and the function . (., .) = . (., .., ⋯ , ..) is continuous from . to . with . For each . the function . (., .) is periodic in . with period ..

Coeval

Custom Monotonicity Methods,Consider the problem . where . is a bounded domain whose boundary is a smooth manifold, and .(., .) is a continuous function on . The following theorem will be a corollary of the results of this chapter.

intertwine

Decimate

滔滔不绝地讲

Insatiable

Radially Symmetric Wave Equations,In this chapter we study periodic solutions of the Dirichlet problem for the semilinear wave equation . where

事物的方面

Multiple Solutions,A typical characteristic of nonlinear problems is the fact that many times there are multiple solutions. Usually it is difficult to obtain any solutions, let alone more than one. In general, it is much harder to determine when there are even two.