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Categorical notions of fibration

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Loregiàn,  Fosco
Max Planck Institute for Mathematics, Max Planck Society;

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arXiv:1806.06129.pdf
(Preprint), 246KB

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Citation

Loregiàn, F., & Riehl, E. (2020). Categorical notions of fibration. Expositiones Mathematicae, 38(4), 496-514. doi:10.1016/j.exmath.2019.02.004.


Cite as: https://hdl.handle.net/21.11116/0000-0006-9DCB-5
Abstract
Fibrations over a category $B$, introduced to category theory by
Grothendieck, encode pseudo-functors $B^{op} \rightsquigarrow {\bf Cat}$, while
the special case of discrete fibrations encode presheaves $B^{op} \to {\bf
Set}$. A two-sided discrete variation encodes functors $B^{op} \times A \to
{\bf Set}$, which are also known as profunctors from $A$ to $B$. By work of
Street, all of these fibration notions can be defined internally to an
arbitrary 2-category or bicategory. While the two-sided discrete fibrations
model profunctors internally to ${\bf Cat}$, unexpectedly, the dual two-sided
codiscrete cofibrations are necessary to model $\cal V$-profunctors internally
to $\cal V$-$\bf Cat$.