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earned this badge 52 times.
components of E[p], E universal in char p.
Awarded Oct 11, 2021 at 12:06
Unipotent linear algebraic groups
Awarded May 10, 2021 at 7:36
Quasi-separatedness for Algebraic Spaces
Awarded May 6, 2019 at 15:55
Intuition for rational functions
Awarded Nov 5, 2018 at 17:00
Does projectiveness descend along field extensions?
Awarded Feb 12, 2018 at 20:58
Modular curves of genus zero and normal forms for elliptic curves
Awarded Apr 14, 2016 at 16:00
What is an example of a regular realization of $C_5$ over $\mathbb{Q}(x)$?
Awarded Apr 5, 2016 at 15:35
What can we do with a coarse moduli space that we can't do with a DM moduli stack?
Awarded Feb 10, 2015 at 3:31
Simplifying the definition of a geometric context using sieves?
Awarded Dec 1, 2014 at 18:51
What are examples illustrating the usefulness of Krull (i.e., rank > 1) valuations?
Awarded Aug 4, 2014 at 9:32
Does a locally free sheaf over a product pushforward to a locally free sheaf?
Awarded Jul 15, 2013 at 4:15
Is the fixed locus of a group action always a scheme?
Awarded Mar 12, 2013 at 2:35
Can Hom_gp(G,H) fail to be representable for affine algebraic groups?
Awarded Feb 27, 2013 at 15:05
Existence of fine moduli space for curves and elliptic curves
Awarded Aug 10, 2012 at 22:50
Are Jacobians principally polarized over non-algebraically closed fields?
Awarded May 15, 2012 at 17:05
Does formally etale imply flat for noetherian schemes?
Awarded Jan 3, 2012 at 18:35
fpqc covers of stacks
Awarded Aug 25, 2011 at 6:35
Points of a variety defined by Galois descent
Awarded Jun 8, 2011 at 22:20
Is $Sym^n (V^*) \cong Sym^n (V)^\ast$ naturally in positive characteristic?
Awarded Jan 29, 2011 at 23:35
Is a quotient of a reductive group reductive?
Awarded Dec 20, 2010 at 7:50
Moduli stack of principally polarized abelian varieties
Awarded Dec 14, 2010 at 9:35
To prove the Nullstellensatz, how can the general case of an arbitrary algebraically closed field be reduced to the easily-proved case of an uncountable algebraically closed field?
Awarded Dec 11, 2010 at 6:35
Galois cohomology of linear groups over local fields
Awarded Dec 11, 2010 at 6:20
Why does non-abelian group cohomology exist?
Awarded Nov 2, 2010 at 8:35
Example of connected-etale sequence for group schemes over a Henselian field?
Awarded Oct 30, 2010 at 5:20
What is the difference between PSL_2 and PGL_2?
Awarded Oct 30, 2010 at 1:05
Equivalence of ordered and unordered cech cohomology.
Awarded Oct 2, 2010 at 19:35
Semi-linear operators
Awarded Oct 2, 2010 at 19:20
Classification of (compact) Lie groups
Awarded Sep 28, 2010 at 9:50
The central role of varieties (a comment from Mumford's Red Book)
Awarded Sep 12, 2010 at 13:50
When is a coarse moduli space also a fine moduli space?
Awarded Sep 3, 2010 at 17:50
Why do automorphism groups of algebraic varieties have natural algebraic group structure?
Awarded Aug 10, 2010 at 19:20
Is projectiveness a Zariski-local property of modules? (Answered: Yes!)
Awarded Aug 9, 2010 at 4:05
Does "finitely presented" mean "always finitely presented"? (Answered: Yes!)
Awarded Aug 1, 2010 at 13:35
Are complex semisimple Lie groups matrix groups?
Awarded Jun 18, 2010 at 21:20
The order of the discriminant of a good-reduction elliptic curve
Awarded May 19, 2010 at 19:35
non principally polarized complex abelian varieties
Awarded May 16, 2010 at 19:20
Complete intersections and flat families
Awarded Apr 24, 2010 at 17:35
Universal definition of tangent spaces (for schemes and manifolds)
Awarded Apr 8, 2010 at 2:20
How do we study the theory of reductive groups?
Awarded Mar 27, 2010 at 6:20
Realizations and pinnings (épinglages) of reductive groups
Awarded Mar 20, 2010 at 23:50
Books on reductive groups using scheme theory
Awarded Mar 15, 2010 at 8:21
Extra principal Cartier divisors on non-Noetherian rings? (answered: no!)
Awarded Mar 10, 2010 at 8:20
Flatness and local freeness
Awarded Mar 10, 2010 at 6:35
How does one classify finite flat group schemes over a ring where p is nilpotent?
Awarded Mar 5, 2010 at 2:20
When is an irreducible scheme quasi-compact?
Awarded Feb 24, 2010 at 0:35
Standard reduction to the artinian local case?
Awarded Feb 21, 2010 at 19:20
What is a good introductory text for moduli theory?
Awarded Feb 18, 2010 at 8:05
Why are Tamagawa numbers equal to Pic/Sha?
Awarded Feb 16, 2010 at 15:35
Non-representable functor, representable on locally Noetherian schemes?
Awarded Feb 14, 2010 at 20:05
The algebraic fundamental group of a reductive algebraic group
Awarded Feb 13, 2010 at 20:35
Comparing algebraic group orbits over big and small algebraically closed fields
Awarded Feb 10, 2010 at 17:20

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