Randall Pyke
Virial Relations for Nonlinear Wave Equations 
and Nonexistence of Almost-Periodic Solutions 
(137K, LaTeX)

ABSTRACT.   We Present a formalism for constructing integral identities involving 
 time almost-periodic solutions of nonlinear wave equations. As an 
 application we prove a nonexistence theorem that is applicable to a 
 large class of nonlinearities.