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We deeply analyse the structural organisation of the fibration of points and of the monad of internal groupoids. From that we derive: 1) a new characterization of internal groupoids among reflexive graphs in the Mal'cev context; 2) a setting in which a Mal'cev category is necessarily a protomodular category.
@article{TAC_2013_28_a4, author = {Dominique Bourn}, title = {On the monad of internal groupoids}, journal = {Theory and applications of categories}, pages = {150--65}, publisher = {mathdoc}, volume = {28}, year = {2013}, language = {en}, url = {http://geodesic.mathdoc.fr/item/TAC_2013_28_a4/} }
Dominique Bourn. On the monad of internal groupoids. Theory and applications of categories, Tome 28 (2013), pp. 150-65. http://geodesic.mathdoc.fr/item/TAC_2013_28_a4/