Section: New Results
Extension of the Razumikhin's theorem
Participants : Frederic Mazenc, Michael Malisoff [LSU] .
The Razumikhin's Theorem is a major extension of the Lypunov function theory, making possible to establish the global asymptotic stability of nonlinear systems with delays. It is especially efficient when the delays are time-varying. We provide in  an extension of this theorem for continuous-time time-varying systems with time-varying delays. Our result uses a novel `strictification' technique for converting a nonstrict Lyapunov function into a strict one. Our examples show how our method can sometimes allow broader classes of allowable delays than the results in the literature.