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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 definitions deformation-theory descent diagrams differential differential-cohomology differential-equations differential-geometry digraphs duality elliptic-cohomology enriched fibration 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 object 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 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.
   • CommentAuthorAndrew Stacey
   • CommentTimeMar 23rd 2012
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   Author: Andrew Stacey
   Format: MarkdownItexThe statement at [[compact support]] was that $f^{-1}(0)$ should be compact. I've corrected this.

   The statement at compact support was that $f^{-1}(0)$ should be compact. I’ve corrected this.

2. • CommentRowNumber2.
   • CommentAuthorUrs
   • CommentTimeMar 23rd 2012
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   Author: Urs
   Format: MarkdownItexEr, sorry. Not sure what happened there. Thanks for catching this.

   Er, sorry. Not sure what happened there. Thanks for catching this.

3. • CommentRowNumber3.
   • CommentAuthorTobyBartels
   • CommentTimeMar 24th 2012
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   Author: TobyBartels
   Format: MarkdownItexI added some generalising remarks.

   I added some generalising remarks.

4. • CommentRowNumber4.
   • CommentAuthorYaron
   • CommentTimeMar 24th 2012
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   Author: Yaron
   Format: MarkdownItexIf I may ask, wouldn't it be better to define "support of a function" (as done implicitly in [[compact support]]) and "compact" separately?

   If I may ask, wouldn’t it be better to define “support of a function” (as done implicitly in compact support) and “compact” separately?

5. • CommentRowNumber5.
   • CommentAuthorTobyBartels
   • CommentTimeMar 24th 2012
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   Author: TobyBartels
   Format: MarkdownItexProbably. The general notion is more complicated than one might expect; see [Wikipedia](https://en.wikipedia.org/wiki/Support_%28mathematics%29). But we can put it in bit by bit as needed.

   Probably. The general notion is more complicated than one might expect; see Wikipedia. But we can put it in bit by bit as needed.