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May 7, 2010 at 4:45 answer added S. Carnahan timeline score: 2
Apr 28, 2010 at 5:41 comment added Herb Thanks, Tim. I know that somehow CP^1 is a basis, but I am trying to understand why. I think it is because CP^1 is the characteristic class for H_2, but I am not sure. Would you please suggest.?
Apr 23, 2010 at 2:03 comment added Tim Perutz Herb, to get you started, can you describe $H_2(\mathbb{CP}^2)$ as an abstract group? Can you write down a basis in terms of embedded oriented surfaces?
Apr 23, 2010 at 0:35 answer added Herb timeline score: 1
Apr 22, 2010 at 22:53 comment added David E Speyer As regards the math, I don't really understand what you are asking, but does is this mathoverflow.net/questions/20336/… the same as your question?
Apr 22, 2010 at 22:51 comment added David E Speyer I fixed some of your formatting difficulties; I hope I didn't introduce any errors.
Apr 22, 2010 at 22:50 history edited David E Speyer CC BY-SA 2.5
deleted 53 characters in body
Apr 22, 2010 at 19:01 history asked HErb CC BY-SA 2.5