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On the Reciprocal of a K-Matrix*
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If the K-matrix A has a two-sided Kr-reciprocal A-1, then A-1 is itself a K-matrix.
For definitions and properties of K-and Kr-matrices, see Cooke [ 3 ] ; we follow the notation used in this book. The result is of interest, since the sets of Kr- and if-matrices are Banach algebras, the former containing the latter as a subalgebra.
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