Existence of positive solutions for generalized Lyapunov equations via a coupled fixed point theorem

Details Existence of positive solutions for generalized Lyapunov equations via a coupled fixed point theorem Existence of positive solutions for generalized Lyapunov equations via a coupled fixed point theorem

2012-03-07

arxiv.org/abs/1203.1821v1

Mathematics

Numerical Analysis

8 pages

Scientific paper

We consider the generalized continuous-time Lyapunov equation: $$ A^*XB + B^*XA =-Q, $$ where $Q$ is an $N\times N$ Hermitian positive definite matrix and $A,B$ are arbitrary $N\times N$ matrices. Under some conditions, using the coupled fixed point theorem of Bhaskar and Lakshmikantham, we establish the existence and uniqueness of Hermitian positive definite solution for such equation. Moreover, we provide an iteration method to find convergent sequences which converge to the solution if one exists.

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