nLab copresheaf

Context

Topos Theory

Could not include topos theory - contents

Contents

Definition

A copresheaf on a category $C$ is a presheaf on the opposite category $C^{op}$.

In other words, a co-presheaf on $C$ is just a functor on $C$. One speaks of functors as co-presheafs if one wants to impose a gluing condition on them and pass to cosheaves.

Revised on July 1, 2013 09:54:50 by Urs Schreiber (89.204.139.146)