Abstract
A procedure to find the existence and domain of asymptotic stability for a class of systems described by a set of non-linear partial differential equations is presented in the context of semigroup theory.
No a priori bound is imposed on the non-linearity which is assumed to be a quad ratic (bilinear) or multilinear form.
The linearized system can be non-self-adjoint and need not be asymptotically stable equation by equation.
The solution of the stability problem is carried out. in two steps :
(a) the development of an L2-like norm that bounds above the sup norm, a requirement to obtain a useful estimate of the non-linear term, and
(a)the computation of an estimate of the L2-likc norm of the semigroup generated by the linearized system in terms of its usual L2 norm.
Notes
Work supported by the National Science Foundation, NSF-GK-23091.