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Dec 14, 2011 at 3:31 comment added Andrey Gogolev Nikita, I don't know other approaches to the problem, but I am not an expert, I just happened to have read the Rohlin's paper. Does Seiberg-Witten give better estimates for even classes in $CP^2$?
Dec 13, 2011 at 20:33 comment added Nikita Kalinin Oh,yes. Thank you. It's founded on the idea that $ka$ with $k>>0$ can't be presented as sphere if $a\cdot a\ne 0$ (and additional estimations...). Does there exist other ideas which can be formulated such simply way?
Dec 13, 2011 at 3:21 history edited Andrey Gogolev CC BY-SA 3.0
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Dec 13, 2011 at 1:28 history edited Andrey Gogolev CC BY-SA 3.0
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Dec 12, 2011 at 22:06 history answered Andrey Gogolev CC BY-SA 3.0