Geodesic
In category of sets and relations, it is possible to describe functions in purely category terms
Eurasian mathematical journal, Tome 6 (2015) no. 2, pp. 90-94 
V. Kreinovich; M. Ceberio; Q. Brefort. In category of sets and relations, it is possible to describe functions in purely category terms. Eurasian mathematical journal, Tome 6 (2015) no. 2, pp. 90-94. http://geodesic.mathdoc.fr/item/EMJ_2015_6_2_a6/
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     title = {In category of sets and relations, it is possible to describe functions in~purely category terms},
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Voir la notice de l'article provenant de la source Math-Net.Ru

We prove that in the category of sets and relations, it is possible to describe functions in purely category terms.

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