On quasivarieties and varieties as categories

Studia Logica 78 (1):7-33 (2004)
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Abstract

Finitary quasivarieties are characterized categorically by the existence of colimits and of an abstractly finite, regularly projective regular generator G. Analogously, infinitary quasivarieties are characterized: one drops the assumption that G be abstractly finite. For varieties the characterization is similar: the regular generator is assumed to be exactly projective, i.e., hom is an exact functor. These results sharpen the classical characterization theorems of Lawvere, Isbell and other authors

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2005

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10.1007/s11225-005-7033-6

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