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Mohan
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22
Example of an ample line bundle $L$ with $L^{\otimes m}$ very ample and $L^{\otimes (m+1)}$ not very ample
Oct 30, 2015
16
Do automorphisms of a finitely generated free module restrict to automorphisms on every invariant submodule?
Sep 20, 2017
15
Is there a non-homogeneous ideal whose radical is homogeneous?
May 17, 2017
12
"path-connectedness" of an algebraic variety
Oct 30, 2015
10
Normal bundle of a section of a projective bundle
Jun 11, 2017
9
Slope-stability: subsheaves vs. subbundles
Sep 6, 2020
9
Hartshorne exercise 1.1 (c)
Sep 1, 2017
8
how to prove that an algebraic variety is normal but not smooth?
Feb 5, 2016
8
Top exterior product of exact sequence
Jun 2, 2016
8
Finite morphism of varieties - morphism of sheaves
Jan 21, 2017
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21
Why there is a Quot-scheme, not a Sub-scheme?
18
Examples of simultaneous independent breakthroughs
15
In $\mathbb{C}[x,y]$: If $\langle u,v \rangle$ is a maximal ideal, then $\langle u-\lambda,v-\mu \rangle$ is a maximal ideal?
14
An analogue of the Bass-Quillen conjecture with power or Laurent series
13
Are units of rings of functions on algebraic varieties finitely generated (mod. constants)?