Why two-point blow up of $CP^2$ can be diffeomorphic to blow up of $S^2 \times S^2$?
We may consider their intersection form and see that they are homeomorphoc, but is there any explicit construction of diffeomorphism?
2026-03-28 14:44:08.1774709048
Why two-point blow up of $CP^2$ can be diffeomorphic to blow up of $S^2 \times S^2$?
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