Exotic n-d'Alembert PDE's and Stability

Abstract

In the framework of the PDE's algebraic topology, previously introduced by A. Prástaro, {\em exotic $n$-d'Alembert PDE's} are considered. These are $n$-d'Alembert PDE's, $(d^{\prime }A{)}_n$, admitting Cauchy manifolds $N\subset (d^{\prime }A{)}_n$ identifiable with exotic spheres, or such that $\partial N$, can be exotic spheres. For such equations local and global existence theorems and stability theorems are obtained.

13 pages