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• CommentRowNumber1.
• CommentAuthorUrs
• CommentTimeNov 15th 2011

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

• CommentRowNumber2.
• CommentAuthorjim_stasheff
• CommentTimeNov 15th 2011
You might want to add to your references an obvious one(which I am too modest to name !) listed in the wiki
• CommentRowNumber3.
• CommentAuthorTodd_Trimble
• CommentTimeNov 15th 2011

Jim: done.

• CommentRowNumber4.
• CommentAuthorDavidRoberts
• CommentTimeNov 16th 2011

Nice one, Jim.

• CommentRowNumber5.
• CommentAuthorUrs
• CommentTimeNov 16th 2011

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.

• CommentRowNumber6.
• CommentAuthorTobyBartels
• CommentTimeNov 16th 2011

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.