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2-category 2-category-theory abelian-categories adjoint algebra algebraic algebraic-geometry algebraic-topology analysis analytic-geometry arithmetic arithmetic-geometry beauty bundles calculus categorical categories category category-theory chern-weil-theory cohesion cohesive-homotopy-type-theory cohomology colimits combinatorics complex-geometry computable-mathematics computer-science constructive constructive-mathematics cosmology deformation-theory descent diagrams differential differential-cohomology differential-equations differential-geometry digraphs duality elliptic-cohomology enriched fibration foundations functional-analysis functor galois-theory 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 lie-theory limit limits linear linear-algebra locale localization logic mathematics measure 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 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 type type-theory universal variational-calculus

1. • CommentRowNumber1.
   • CommentAuthorUrs
   • CommentTimeNov 15th 2011
   • PermaLink
   Author: Urs
   Format: MarkdownItexadded to [[Stiefel-Whitney class]] briefly the definition/characterization.

   added to Stiefel-Whitney class briefly the definition/characterization.

2. • CommentRowNumber2.
   • CommentAuthorjim_stasheff
   • CommentTimeNov 15th 2011
   • PermaLink
   Author: jim_stasheff
   Format: TextYou might want to add to your references an obvious one(which I am too modest to name !) listed in the wiki

   You might want to add to your references an obvious one(which I am too modest to name !) listed in the wiki
3. • CommentRowNumber3.
   • CommentAuthorTodd_Trimble
   • CommentTimeNov 15th 2011
   • PermaLink
   Author: Todd_Trimble
   Format: MarkdownItexJim: done.

   Jim: done.

4. • CommentRowNumber4.
   • CommentAuthorDavidRoberts
   • CommentTimeNov 16th 2011
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   Author: DavidRoberts
   Format: MarkdownItexNice one, Jim.

   Nice one, Jim.

5. • CommentRowNumber5.
   • CommentAuthorUrs
   • CommentTimeNov 16th 2011
   • PermaLink
   Author: Urs
   Format: MarkdownItexSorry for not having added the link earlier. I did have it at [[characteristic class]] and [[Pontryagin class]], now I copied it over to [[Chern class]], too. If you see it missing elsewhere, please just add it. As opposed to Wikipedia, on the $n$Lab you may be non-modest, if only it helps spread useful information.

   Sorry for not having added the link earlier. I did have it at characteristic class and Pontryagin class, now I copied it over to Chern class, too.

   If you see it missing elsewhere, please just add it. As opposed to Wikipedia, on the $n$Lab you may be non-modest, if only it helps spread useful information.

6. • CommentRowNumber6.
   • CommentAuthorTobyBartels
   • CommentTimeNov 16th 2011
   • PermaLink
   Author: TobyBartels
   Format: MarkdownItexYes, the nLab is *our* lab notebook, and we may wish to make note of where *our* papers are relevant to material in *our* notebook.

   Yes, the nLab is our lab notebook, and we may wish to make note of where our papers are relevant to material in our notebook.