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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 nforum 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 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
   • CommentTimeAug 27th 2012
   • PermaLink
   Author: Urs
   Format: MarkdownItexadded at _[[exact sequence]]_ two small _[lemmas on forming quotients in an exact sequence](http://ncatlab.org/nlab/show/exact+sequence#SESAndQuotients)_

   added at exact sequence two small lemmas on forming quotients in an exact sequence

2. • CommentRowNumber2.
   • CommentAuthorUrs
   • CommentTimeSep 2nd 2012
   • PermaLink
   Author: Urs
   Format: MarkdownItexexpanded and polished a bit more at _[[exact sequence]]_ .

   expanded and polished a bit more at exact sequence .

3. • CommentRowNumber3.
   • CommentAuthorUrs
   • CommentTimeSep 12th 2012
   • PermaLink
   Author: Urs
   Format: MarkdownItexAdded a basic proof in the Definition-section at _[[exact sequence]]_ and added a basic example at _[Specific examples](http://ncatlab.org/nlab/show/exact+sequence#SpecificExamples)_

   Added a basic proof in the Definition-section at exact sequence and added a basic example at Specific examples

4. • CommentRowNumber4.
   • CommentAuthorDexter Chua
   • CommentTimeSep 1st 2016
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   Author: Dexter Chua
   Format: MarkdownItexAdded the notion of an exact sequence of pointed sets.

   Added the notion of an exact sequence of pointed sets.

5. • CommentRowNumber5.
   • CommentAuthorUrs
   • CommentTimeSep 1st 2016
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   Author: Urs
   Format: MarkdownItexThanks for all your additions!

   Thanks for all your additions!