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 1d revised How does extension of restriction of $M$ relate to $M$? edited title 1d answered Irreducible components of fiber bundle Apr 23 revised How does extension of restriction of $M$ relate to $M$? added 7 characters in body Apr 23 asked How does extension of restriction of $M$ relate to $M$? Mar 9 accepted Does taking torsion commute with extension of scalars by a flat module? Mar 8 asked Does taking torsion commute with extension of scalars by a flat module? Mar 7 awarded Nice Answer Mar 7 revised Pullback of sheaf of a divisor by a desingularization mod torsion. added 771 characters in body Mar 6 revised Pullback of sheaf of a divisor by a desingularization mod torsion. [Edit removed during grace period] Mar 6 asked Pullback of sheaf of a divisor by a desingularization mod torsion. Mar 5 comment Is the pullback of an ample divisor always nef? @TakumiMurayama Thank you. Mar 5 comment Is the pullback of an ample divisor always nef? @TakumiMurayama thank you for that link. Does $f$ begin proper help to pullback divisors? Is this used to show that the pullback of semi-ample is semi-ample? Mar 5 comment Is the pullback of an ample divisor always nef? @Mohan maybe it isn't defined and I am just confused. I need to learn intersection theory. Mar 5 asked Is the pullback of an ample divisor always nef? Jan 31 comment Example of two sequences $(a_n)$ and $(b_n)$ such that both of them are bounded, neither of them is convergent, but $(a_n + b_n)$ is convergent? Think $-1$'s and $+1$'s Jan 11 comment Why is $[\widetilde{v},\widetilde{w}]_p(f)=0$ when $f$ has a critical point at $p$? @Marc $[\tilde{v},\tilde{w}]$ is a vector field, and $[\tilde{v},\tilde{w}]_p(f)$ means to differentiate $f$ at $p$ in the direction of $[\tilde{v},\tilde{w}]_p$. Since $p$ is a critical point of $f$, the total derivative of $f$ is zero at $p$, and hence every directional derivative is zero as well. Dec 5 revised Vanishing of Tor sheaf on a union of subschemes with vanishing Tor. added 12 characters in body Dec 4 asked Vanishing of Tor sheaf on a union of subschemes with vanishing Tor. Nov 28 awarded Nice Answer Nov 14 awarded Popular Question