Decidability and structure
Paweł Idziak (1999)
Banach Center Publications
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Paweł Idziak (1999)
Banach Center Publications
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Ramalho, Margarita (2001)
Portugaliae Mathematica. Nova Série
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Don Pigozzi (1981)
Colloquium Mathematicae
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Hilda Draškovičová (1977)
Mathematica Slovaca
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Jaromír Duda (1987)
Mathematica Slovaca
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Ivan Chajda (2000)
Discussiones Mathematicae - General Algebra and Applications
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Varieties whose algebras have no idempotent element were characterized by B. Csákány by the property that no proper subalgebra of an algebra of such a variety is a congruence class. We simplify this result for permutable varieties and we give a local version of the theorem for varieties with nullary operations.
Ivan Chajda (1988)
Mathematica Slovaca
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Dietmar Schweigert (1988)
Banach Center Publications
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