Bicategory

In mathematics, a bicategory is a concept in category theory used to extend the notion of category to handle the cases where the composition of morphisms is not (strictly) associative, but only associative up to an isomorphism. The notion was introduced in 1967 by Jean Bénabou.

Formally, a bicategory B consists of:

with some more structure:

The horizontal composition is required to be associative up to a natural isomorphism α between morphisms h*(g*f) and (h*g)*f. Some more coherence axioms, similar to those needed for monoidal categories, are moreover required to hold.

Bicategories may be considered as a weakening of the definition of 2-categories. A similar process for 3-categories leads to tricategories, and more generally to weak n-categories for n-categories.

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