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Characterization of preclones by matrix collections

Lehtonen, Erkko

Asian-European Journal of Mathematics, 3(3) (2010), 457-473
http://dx.doi.org/10.1142/S1793557110000313

Preclones are described as the closed classes of the Galois connection induced by a preservation relation between operations and matrix collections. The Galois closed classes of matrix collections are also described by explicit closure conditions.