Finite Equations in n Unknowns
Dragić Banković (1997)
Publications de l'Institut Mathématique
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Dragić Banković (1997)
Publications de l'Institut Mathématique
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Dragić Banković (2001)
Kragujevac Journal of Mathematics
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Jovan D. Kečkić (1982)
Publications de l'Institut Mathématique
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Milan Božić (1975)
Publications de l'Institut Mathématique
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Dragić Banković (1992)
Publications de l'Institut Mathématique
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Dragić Banković (1990)
Publications de l'Institut Mathématique
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Chris Brink (1993)
Banach Center Publications
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The purpose of this note is to show that a known and natural four-valued logic co-exists with classical two-valued logic in the familiar context of truth tables. The tool required is the power construction.
Dirk Leinders, Jan Van Den Bussche (2009)
RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications
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Codd defined the relational algebra [E.F. Codd, Communications of the ACM 13 (1970) 377–387; E.F. Codd, Relational completeness of data base sublanguages, in Data Base Systems, R. Rustin, Ed., Prentice-Hall (1972) 65–98] as the algebra with operations projection, join, restriction, union and difference. His projection operator can drop, permute and repeat columns of a relation. This permuting and repeating of columns does not really add expressive power to the relational algebra. Indeed,...
Prešić, Slaviša B. (1988)
Publications de l'Institut Mathématique. Nouvelle Série
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