Commutative weak generalized inverses of a square matrix and some related matrix equations.
Kečkić, Jovan D. (1985)
Publications de l'Institut Mathématique. Nouvelle Série
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Kečkić, Jovan D. (1985)
Publications de l'Institut Mathématique. Nouvelle Série
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Wacław Szymański (1977)
Annales Polonici Mathematici
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Ivan Chajda (2007)
Discussiones Mathematicae - General Algebra and Applications
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The concept of a commutative directoid was introduced by J. Ježek and R. Quackenbush in 1990. We complete this algebra with involutions in its sections and show that it can be converted into a certain implication algebra. Asking several additional conditions, we show whether this directoid is sectionally complemented or whether the section is an NMV-algebra.
Rechnoi, V. (2005)
Lobachevskii Journal of Mathematics
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Vladimir Volenec (1987)
Stochastica
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A laterally commutative heap can be defined on a given set iff there is the structure of a TST-space on this set.
Mazanik, S.A. (1998)
Memoirs on Differential Equations and Mathematical Physics
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G. Duchamp, D. Krob (1992)
Semigroup forum
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S. A. Mazanik (2002)
Mathematica Bohemica
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The class of linear differential systems with coefficient matrices which are commutative with their integrals is considered. The results on asymptotic equivalence of these systems and their distribution among linear systems are given.