This is a preview. Log in through your library . Abstract Let $A$ be a proper $H^\ast$-algebra and let $B$ be a Banach $^\ast$-algebra with an identity. A linear ...
This is a preview. Log in through your library . Abstract The Hermitian positive definite solutions of the matrix equation X — A*X⁻² A = I are studied. A theorem for existence of solutions is given ...
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