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A universal property of the monoidal 2-category of cospans of ordinals and surjections
Theory and applications of categories, Tome 18 (2007), pp. 631-653 Cet article a éte moissonné depuis la source Theory and Applications of Categories website

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We prove that the monoidal 2-category of cospans of ordinals and surjections is the universal monoidal category with an object X with a semigroup and a cosemigroup structures, where the two structures satisfy a certain 2-dimensional separable algebra condition.

Classification : 18D5, 18D10, 18D35
Keywords: 2-categories, monoidal categories, structured objects 
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     author = {M. Menni and N. Sabadini and R. F. C. Walters},
     title = {A universal property of the monoidal 2-category of cospans of ordinals and 
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     journal = {Theory and applications of categories},
     pages = {631--653},
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     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAC_2007_18_a19/}
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M. Menni; N. Sabadini; R. F. C. Walters. A universal property of the monoidal 2-category of cospans of ordinals and 
surjections. Theory and applications of categories, Tome 18 (2007), pp. 631-653. http://geodesic.mathdoc.fr/item/TAC_2007_18_a19/