On the join of equational classes of idempotent algebras and algebras with constants
J. Płonka (1973)
Colloquium Mathematicae
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J. Płonka (1973)
Colloquium Mathematicae
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J. Płonka (1976)
Colloquium Mathematicae
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A. R. Blass, L. Falcao, Č. V. Stanojević (1970)
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J. Płonka (1968)
Fundamenta Mathematicae
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Jerzy Płonka (1969)
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James S. Johnson (1969)
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Jerzy Płonka (1967)
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So, Keum Sook (2011)
International Journal of Mathematics and Mathematical Sciences
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Evelyn Nelson (1974)
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Tarek Sayed Ahmed (2002)
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SC, CA, QA and QEA stand for the classes of Pinter's substitution algebras, Tarski's cylindric algebras, Halmos' quasipolyadic algebras and Halmos' quasipolyadic algebras with equality, respectively. Generalizing a result of Andréka and Németi on cylindric algebras, we show that for K ∈ SC,QA,CA,QEA and any β > 2 the class of 2-dimensional neat reducts of β-dimensional algebras in K is not closed under forming elementary subalgebras, hence is not elementary. Whether this result extends...
J. Neggers, Hee Sik Kim (2002)
Matematički Vesnik
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R. Beazer (1974)
Colloquium Mathematicae
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T. P. Speed (1971)
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H. Skala (1973)
Fundamenta Mathematicae
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