+++ title = "Presheaf" author = "Yann Herklotz" tags = [] categories = [] backlinks = ["4d2c"] forwardlinks = [] zettelid = "4d2d" +++ A presheaf is a functor from the co-category to the category of sets. This means that it can be expressed as the following: $C^{\mathit{op}}\rightarrow \mathit{Set}$