An $n\times n$ complex matrix $A$ is called Re-nonnegative definite (Re-nnd) if the real part of $x^{\ast } Ax$ is nonnegative for every complex $n$-vector $x$. In this paper criteria for a partitioned matrix to be Re-nnd are given. A necessary and sufficient condition for the existence of and an expression for the Re-nnd solutions of the matrix equation $AXB=C$ are presented.
@article{118980, author = {Qing Wen Wang and Chang Lan Yang}, title = {The Re-nonnegative definite solutions to the matrix equation $AXB=C$}, journal = {Commentationes Mathematicae Universitatis Carolinae}, volume = {39}, year = {1998}, pages = {7-13}, zbl = {0937.15008}, mrnumber = {1622312}, language = {en}, url = {http://dml.mathdoc.fr/item/118980} }
Wang, Qing Wen; Yang, Chang Lan. The Re-nonnegative definite solutions to the matrix equation $AXB=C$. Commentationes Mathematicae Universitatis Carolinae, Tome 39 (1998) pp. 7-13. http://gdmltest.u-ga.fr/item/118980/
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