Abstract
In this paper the problem of determining necessary and sufficient conditions for the Lyapunov function for a pair of stable linear time-invariant systems whose system matrices, A/sub 1/, A/sub 2/, are in companion form is considered. It is shown that a necessary and sufficient condition for the existence of such a function is that the matrix product A/sub 1/A/sub 2/ does not have an eigenvalue that is real and negative. Examples are presented to illustrate the result.
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