Direct limits of congruence systems
Manfred Armbrust (1973)
Colloquium Mathematicae
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Manfred Armbrust (1973)
Colloquium Mathematicae
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Scott Ahlgren (2003)
Acta Arithmetica
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Pambuccian, Victor (2008)
Beiträge zur Algebra und Geometrie
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Marica D. Prešić (1979)
Publications de l'Institut Mathématique
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Hao Pan (2007)
Acta Arithmetica
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Magill, K.D.jun. (1984)
International Journal of Mathematics and Mathematical Sciences
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Ying Zhang (2007)
Acta Arithmetica
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Ivan Chajda, Radomír Halaš (2002)
Discussiones Mathematicae - General Algebra and Applications
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We present a countable infinite chain of conditions which are essentially weaker then congruence modularity (with exception of first two). For varieties of algebras, the third of these conditions, the so called 4-submodularity, is equivalent to congruence modularity. This is not true for single algebras in general. These conditions are characterized by Maltsev type conditions.
J.C. Lagarias, D. Moews (1995)
Discrete & computational geometry
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Richter, Christian (2009)
Beiträge zur Algebra und Geometrie
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E. Nazarewicz, M. O'Brien, M. O'Neill, C. Staples (2007)
Acta Arithmetica
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C.C. Edwards (1979)
Semigroup forum
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S.A. Rankin (1981)
Semigroup forum
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PAUL KUSTAANHEIMO (1957)
Mathematica Scandinavica
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Gerhard Dorfer (2001)
Discussiones Mathematicae - General Algebra and Applications
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In this paper congruences on orthomodular lattices are studied with particular regard to analogies in Boolean algebras. For this reason the lattice of p-ideals (corresponding to the congruence lattice) and the interplay between congruence classes is investigated. From the results adduced there, congruence regularity, uniformity and permutability for orthomodular lattices can be derived easily.
J.C. Lagarias, D. Moews (1995)
Discrete & computational geometry
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