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Universal Algebra and Lattice Theory (Dedicated to the 70th birthday of B. Csakany)
July 22-26, 2002
University of Szeged
Szeged, Hungary |
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Organizers Agnes Szendrei, Laszlo Szabo, Miklos Dorman
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Congruence regularity and its generalizations
by
Guenther Eigenthaler
Vienna University of Technology
Coauthors: Ivan Chajda
In regular algebras (see [8]), every congruence is uniquely
determined by each of its classes, thus also every class containing a given
element c is uniquely determined by a given class. For weakly regular
algebras with a constant 0, every class is determined by the class
containing 0 (see e.g. [9], [10]) and, vice versa,
for locally regular algebras (introduced by the first author in [1]),
the class containing 0 is determined by every congruence class. This scheme
motivated us to find a general concept of dependency of congruence classes
which can be applied not only to the afore mentioned cases but also for other
modifications of congruence regularity
(see [2], [3], [4], [5], [6], [7]).
References
- Chajda I.: Locally regular varieties,
Acta Sci. Math. (Szeged) 64 (1998), 431-435.
- Chajda I., Eigenthaler G.: Dually regular varieties,
Contributions to General Algebra 12 (2000), 121-128.
- Chajda I., Eigenthaler G.: Balanced congruences,
Discuss. Math., General Algebra and Applications, Vol. 21 (2001), 105-114.
- Chajda I., Eigenthaler G.: Some modifications of congruence permutability and dually regular varieties,
Discuss. Math., General Algebra and Applications, Vol. 21 (2001), 165-174.
- Chajda I., Eigenthaler G.: Consistent algebras,
Contributions to General Algebra 13 (2001), 55-62.
- Chajda I., Halas R.: Local coherence for locally regular algebras,
Algebra and Model Theory 2 (Novosibirsk), 1999, 29-33.
- Chajda I., Länger H.: Restricted congruence regularity,
Acta Math. Univ. Comen. (Bratislava), to appear.
- Csákány B.: Characterizations of regular varieties,
Acta Sci. Math. (Szeged) 31 (1970), 187-189.
- Fichtner K.: Varieties of universal algebras with ideals (Russian),
Math. Sb. 75 (1968), 445-453.
- Fichtner K.: Eine Bemerkung über Mannigfaltigkeiten universeller Algebren mit Idealen,
Monatsber. DAW, 12 (1970), 21-25.
Date received: June 5, 2002
Copyright © 2002 by the author(s).
The author(s) of this document and the organizers of the conference
have granted their consent to include this abstract in
Atlas Conferences Inc.
Document # caiv-18.