This paper studies the extension of LaSalle's invariance principle for switched nonlinear systems. Un-like most existing results in which each switching mode in the system needs to be asymptotically stable, this paper allows the switching modes to be only stable. Under certain ergodicity assumptions of the switching signals, two extensions of LaSalle's invariance principle for global asymptotic stability of switched nonlinear systems are obtained using the method of common joint Lyapunov function.
The structure of a canalizing function is discussed.Using a new matrix product,namely semitensor product,the logical function is expressed in its matrix form.From its matrix expression,a criterion is obtained to test whether a logical function is a canalizing function.Then a formula is obtained to calculate the number of canalizing functions.Moreover,an algorithm is presented to generate canalizing functions.Finally,some results obtained are extended to seminested canalizing functions.
