A note on dual discriminator varieties.
Ramalho, Margarita (2001)
Portugaliae Mathematica. Nova Série
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Ramalho, Margarita (2001)
Portugaliae Mathematica. Nova Série
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Ivan Chajda (2001)
Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica
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Czechoslovak Mathematical Journal
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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.