ニュース
Available expressions are reviewed and new ones derived for the inverse of the sum of two matrices, one of them being nonsingular. Particular attention is given to (A + UBV)-1, where A is nonsingular ...
In this paper we study pairs P, Q of permutation matrices with normal sum. We characterise such matrices in two ways and also study the group they generate, proving, in particular, that this group is ...
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