The semiring of quotients of commutative semirings
Syed A. Huq (1973)
Colloquium Mathematicae
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Displaying similar documents to “On anticommutative semirings.”
The semiring of quotients of commutative semirings
A fully equational proof of Parikh’s theorem
Luca Aceto, Zoltán Ésik, Anna Ingólfsdóttir (2002)
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications
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We show that the validity of Parikh’s theorem for context-free languages depends only on a few equational properties of least pre-fixed points. Moreover, we exhibit an infinite basis of -term equations of continuous commutative idempotent semirings.
Szegoö-type properties in a non-commutative case
Wacław Szymański (1977)
Annales Polonici Mathematici
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Laterally commutative heaps and TST-spaces.
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.
Semirings whose additive endomorphisms are multiplicative
Tomáš Kepka (1993)
Commentationes Mathematicae Universitatis Carolinae
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A ring or an idempotent semiring is associative provided that additive endomorphisms are multiplicative.
Semirings without zero divisors.
Hebisch, U., Weinert, H.J. (1990)
Mathematica Pannonica
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Existence theorems for commutative diagrams.
Rechnoi, V. (2005)
Lobachevskii Journal of Mathematics
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Commutative directoids with sectional involutions
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.