Bourn-normal monomorphisms in regular Mal'tsev categories

Giuseppe Metere

Normal monomorphisms in the sense of Bourn describe the equivalence classes of an internal equivalence relation. Although the definition is given in the fairly general setting of a category with finite limits, later investigations on this subject often focus on protomodular settings, where normality becomes a property. This paper clarifies the connections between internal equivalence relations and Bourn-normal monomorphisms in regular Mal'tesv categories with pushouts of split monomorphisms along arbitrary morphisms, whereas a full description is achieved for quasi-pointed regular Mal'tsev categories with pushouts of split monomorphisms along arbitrary morphisms.

Keywords: normal monomorphism, Mal'tsev category, fibred category

2010 MSC: 18D30, 18C05, 08A30

Theory and Applications of Categories, Vol. 32, 2017, No. 5, pp 122-147.

Published 2017-01-27.

http://www.tac.mta.ca/tac/volumes/32/5/32-05.pdf

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