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2-category 2-category-theory abelian-categories adjoint algebra algebraic algebraic-geometry algebraic-topology analysis analytic-geometry arithmetic arithmetic-geometry book bundles calculus categorical categories category category-theory chern-weil-theory cohesion cohesive-homotopy-type-theory cohomology colimits combinatorics complex complex-geometry computable-mathematics computer-science constructive cosmology deformation-theory descent diagrams differential differential-cohomology differential-equations differential-geometry digraphs duality elliptic-cohomology enriched fibration finite foundation foundations functional-analysis functor gauge-theory gebra geometric-quantization geometry graph graphs gravity grothendieck group group-theory harmonic-analysis higher higher-algebra higher-category-theory higher-differential-geometry higher-geometry higher-lie-theory higher-topos-theory homological homological-algebra homotopy homotopy-theory homotopy-type-theory index-theory integration integration-theory k-theory lie-theory limits linear linear-algebra locale localization logic mathematics measure-theory modal modal-logic model model-category-theory monad monads monoidal monoidal-category-theory morphism motives motivic-cohomology nlab noncommutative noncommutative-geometry number-theory of operads operator operator-algebra order-theory pages pasting philosophy physics pro-object probability probability-theory quantization quantum quantum-field quantum-field-theory quantum-mechanics quantum-physics quantum-theory question representation representation-theory riemannian-geometry scheme schemes set set-theory sheaf sheaves simplicial space spin-geometry stable-homotopy-theory stack string string-theory superalgebra supergeometry svg symplectic-geometry synthetic-differential-geometry terminology theory topology topos topos-theory tqft type type-theory universal variational-calculus

1. • CommentRowNumber1.
   • CommentAuthorUrs
   • CommentTimeJun 13th 2018
   • PermaLink
   Author: Urs
   Format: MarkdownItexfor convenience of hyperlinking and disambiguation, I need an entry of this title, in between [[presheaf]] and [[(2,1)-presheaf]]. Started with a brief Idea-section that just scans the different possible meanings and their relation. Might copy over more material from _[[geometry of physics -- categories and toposes]]_ once that has stabilized more. <a href="https://ncatlab.org/nlab/revision/presheaves+of+groupoids/1">v1</a>, <a href="https://ncatlab.org/nlab/show/presheaves+of+groupoids">current</a>

   for convenience of hyperlinking and disambiguation, I need an entry of this title, in between presheaf and (2,1)-presheaf. Started with a brief Idea-section that just scans the different possible meanings and their relation. Might copy over more material from geometry of physics – categories and toposes once that has stabilized more.

   v1, current

2. • CommentRowNumber2.
   • CommentAuthorUrs
   • CommentTimeJun 13th 2018
   • PermaLink
   Author: Urs
   Format: MarkdownItexchanged title to singular <a href="https://ncatlab.org/nlab/revision/presheaf+of+groupoids/1">v1</a>, <a href="https://ncatlab.org/nlab/show/presheaf+of+groupoids">current</a>

   changed title to singular

   v1, current

3. • CommentRowNumber3.
   • CommentAuthorUrs
   • CommentTimeJun 13th 2018
   • PermaLink
   Author: Urs
   Format: MarkdownItexadded mentioning of the [[Cech groupoid]] as an example ([here](https://ncatlab.org/nlab/show/presheaf+of+groupoids#Examples)) <a href="https://ncatlab.org/nlab/revision/presheaf+of+groupoids/1">v1</a>, <a href="https://ncatlab.org/nlab/show/presheaf+of+groupoids">current</a>

   added mentioning of the Cech groupoid as an example (here)

   v1, current