In category theory, a discipline within mathematics, the notion of lax functor between bicategories generalizes that of functors between categories. Let C,D be bicategories. We denote composition in diagrammatic order. A lax functor P from C to D, denoted , consists of the following data: * for each object x in C, an object ; * for each pair of objects x,y ∈ C a functor on morphism-categories, ; * for each object x∈C, a 2-morphism in D; * for each triple of objects, x,y,z ∈C, a 2-morphism in D that is natural in f: x→y and g: y→z. These must satisfy three commutative diagrams, which record the interaction between left unity, right unity, and associativity between C and D. See http://ncatlab.org/nlab/show/pseudofunctor. A lax functor in which all of the structure 2-morphisms, i.e. the and above, are invertible is called a pseudofunctor. (Wikipedia).
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