Ordinary differential control thPory (the classical theory) studies input/output re lations defined by systems of ordinary differential equations (ODE). The var

Lie's group theory of differential equations unifies the many ad hoc methods known for solving differential equations and provides powerful new ways to find sol

This book is devoted to explaining a wide range of applications of con tinuous symmetry groups to physically important systems of differential equations. Emphas

Since the characterization of generators of C0 semigroups was established in the 1940s, semigroups of linear operators and its neighboring areas have developed

An introduction to symmetry methods, informally written and aimed at applied mathematicians, physicists, and engineers.