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  1. Jiří Adámek (2004). On Quasivarieties and Varieties as Categories. Studia Logica 78 (1-2):7 - 33.
    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 (finitary) varieties the characterization is similar: the regular generator is assumed to be exactly projective, i.e., hom(G, –) is an exact functor. These results sharpen the classical characterization theorems of Lawvere, Isbell and other authors.
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  2. Jiří Adámek, Alan H. Mekler, Evelyn Nelson & Jan Reiterman (1988). On the Logic of Continuous Algebras. Notre Dame Journal of Formal Logic 29 (3):365-380.
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