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when toggle format what by license comment
Apr 14, 2017 at 10:33 history edited Mark Grant CC BY-SA 3.0
fixed tex
Jan 7, 2011 at 14:14 history edited Mark Grant CC BY-SA 2.5
fixed reference
Jan 5, 2011 at 3:43 vote accept Daniel Loughran
Jan 1, 2011 at 14:08 history edited Mark Grant CC BY-SA 2.5
deleted 117 characters in body
Dec 31, 2010 at 23:24 comment added Sándor Kovács Uh, yes. You are right.
Dec 31, 2010 at 20:24 comment added Mark Grant Well, $X$ was what I meant to write! This would agree with Sergei Ivanov's comment that $\Delta_f^2=n\chi(Y)=\chi(X)$ when $f$ has $n$ sheets.
Dec 31, 2010 at 18:37 history answered Mark Grant CC BY-SA 2.5