Almost sure stability of controlled degenerate diffusions

Details Almost sure stability of controlled degenerate diffusions Almost sure stability of controlled degenerate diffusions

2004-05-10

arxiv.org/abs/math/0405167v1

Mathematics

Optimization and Control

26 pages

Scientific paper

We develop a direct Lyapunov method for the almost sure open-loop stabilizability and asymptotic stabilizability of controlled degenerate diffusion processes. The infinitesimal decrease condition for a Lyapunov function is a new form of Hamilton-Jacobi-Bellman partial differential inequality of $2nd$ order. We give local and global versions of the First and Second Lyapunov Theorems assuming the existence of a lower semicontinuous Lyapunov function satisfying such inequality in the viscosity sense. An explicit formula for a stabilizing feedback is provided for affine systems with smooth Lyapunov function. Several examples illustrate the theory.

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