Linear operators that strongly preserve
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LeRoy B. Beasley; Norman J. Pullman
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Article
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1992
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Elsevier Science
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English
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Beasley, L.B. and N.J. Pullman, Linear operators that strongly preserve graphical properties of matrices, Discrete Mathematics 104 (1992) 143-157. An operator on the set Ju of n X n matrices strongly preserves a subset 9 if it maps 9 into 9 and A\% into A\%. The operator semigroup of 9 is the semig