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A protolocalisation of a regular category is a full reflective regular subcategory, whose reflection preserves pullbacks of regular epimorphisms along arbitrary morphisms. We devote special attention to the epireflective protolocalisations of an exact Mal'cev category; we characterise them in terms of a corresponding closure operator on equivalence relations. We give some examples in algebra and in topos theory.
@article{TAC_2008_21_a2, author = {Francis Borceux and Marino Gran and Sandra Mantovani}, title = {Protolocalisations of exact {Mal'cev} categories}, journal = {Theory and applications of categories}, pages = {37--60}, publisher = {mathdoc}, volume = {21}, year = {2008}, language = {en}, url = {http://geodesic.mathdoc.fr/item/TAC_2008_21_a2/} }
Francis Borceux; Marino Gran; Sandra Mantovani. Protolocalisations of exact Mal'cev categories. Theory and applications of categories, The Tholen Festschrift, Tome 21 (2008), pp. 37-60. http://geodesic.mathdoc.fr/item/TAC_2008_21_a2/