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added DG tag

edited Apr 9 2012 at 7:54

Yemon Choi
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blow-ups dg.differential-geometry

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asked Apr 9 2012 at 7:50

Second Chern Class of Blow-up

Let X be a compact surface and $\tilde{X}$ its blowing-up, how can I show the formula $c_2(\tilde{X})=c_2(X)+1$?

blow-ups