Geodesic
Bicategories of spans as cartesian bicategories
Theory and applications of categories, Tome 24 (2010), pp. 1-24.

Voir la notice de l'article provenant de la source Theory and Applications of Categories website

Bicategories of spans are characterized as cartesian bicategories in which every comonad has an Eilenberg-Moore object and every left adjoint arrow is comonadic.
Classification : 18A25
Keywords: bicategory, finite products, discrete, comonad, Eilenberg-Moore object 
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Stephen Lack; R.F.C. Walters; R.J. Wood. Bicategories of spans as cartesian bicategories. Theory and applications of categories, Tome 24 (2010), pp. 1-24. http://geodesic.mathdoc.fr/item/TAC_2010_24_a0/