Abstract
The universal algebraic literature is rife with generalisations of discriminator varieties, whereby several investigators have tried to preserve in more general settings as much as possible of their structure theory. Here, we modify the definition of discriminator algebra by having the switching function project onto its third coordinate in case the ordered pair of its first two coordinates belongs to a designated relation (not necessarily the diagonal relation). We call these algebras factor algebras and the varieties they generate factor varieties. Among other things, we provide an equational description of these varieties and match equational conditions involving the factor term with properties of the associated factor relation. Factor varieties include, apart from discriminator varieties, several varieties of algebras from quantum and fuzzy logics.
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Notes
The symbols \(\barwedge \) and \(\veebar \) respectively denote the meta-linguistical conjunction and disjunction in the first order theory of any class of algebras.
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Acknowledgments
A. Ledda gratefully acknowledges the support of the Italian Ministry of Scientific Research (MIUR) within the FIRB project “Structures and Dynamics of Knowledge and Cognition”, Cagliari: F21J12000140001.
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The authors declare that they have no conflicts of interest.
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Communicated by M. L. Dalla Chiara, R. Giuntini, E. Negri and S. Smets.
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Salibra, A., Ledda, A. & Paoli, F. Factor varieties. Soft Comput 21, 1443–1454 (2017). https://doi.org/10.1007/s00500-015-1828-9
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DOI: https://doi.org/10.1007/s00500-015-1828-9