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We define a monad T_n^D^* whose operations are encoded by simple string diagrams and we define n-sesquicategories as algebras over this monad. This monad encodes the compositional structure of n-dimensional string diagrams. We give a generators and relations description of T_n^D^*, which allows us to describe n-sesquicategories as globular sets equipped with associative and unital composition and whiskering operations. One can also see them as strict n-categories without interchange laws. Finally we give an inductive characterization of n-sesquicategories.
@article{TAC_2022_38_a33, author = {Manuel Ara\'ujo}, title = {Simple string diagrams and n-sesquicategories}, journal = {Theory and applications of categories}, pages = {1284--1325}, publisher = {mathdoc}, volume = {38}, year = {2022}, language = {en}, url = {http://geodesic.mathdoc.fr/item/TAC_2022_38_a33/} }
Manuel Araújo. Simple string diagrams and n-sesquicategories. Theory and applications of categories, Tome 38 (2022), pp. 1284-1325. http://geodesic.mathdoc.fr/item/TAC_2022_38_a33/