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1. • CommentRowNumber1.
   • CommentAuthorTim_Porter
   • CommentTimeApr 5th 2014
   • (edited Apr 5th 2014)
   • PermaLink
   Author: Tim_Porter
   Format: MarkdownItexI added the word `helps' to the entry at [[genus of a surface]] since its genus does not fully classify the surface, you need orientability (and then is it a surface with boundary or not).

   I added the word ‘helps’ to the entry at genus of a surface since its genus does not fully classify the surface, you need orientability (and then is it a surface with boundary or not).