75

Answers
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31
fpqc covers of stacks
30
Does “finitely presented” mean “always finitely presented”? (Answered: Yes!)
30
The algebraic fundamental group of a reductive algebraic group
29
Classification of (compact) Lie groups
29
Does formally etale imply flat for noetherian schemes?
23
Is the fixed locus of a group action always a scheme?
23
Why are Tamagawa numbers equal to Pic/Sha?
22
Flatness and local freeness
22
Example of connected-etale sequence for group schemes over a Henselian field?
21
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?
20
What is the difference between PSL_2 and PGL_2?
20
Moduli stack of principally polarized abelian varieties
19
How do we study the theory of reductive groups?
19
Standard reduction to the artinian local case?
18
Non-representable functor, representable on locally Noetherian schemes?
18
Extra principal Cartier divisors on non-Noetherian rings? (answered: no!)
17
What is a good introductory text for moduli theory?
17
The central role of varieties (a comment from Mumford’s Red Book)
17
Complete intersections and flat families
15
Books on reductive groups using scheme theory
15
When is an irreducible scheme quasi-compact?
15
Is projectiveness a Zariski-local property of modules? (Answered: Yes!)
15
Are Jacobians principally polarized over non-algebraically closed fields?
15
Is a quotient of a reductive group reductive?
15
Comparing algebraic group orbits over big and small algebraically closed fields
14
Why do automorphism groups of algebraic varieties have natural algebraic group structure?
14
Existence of fine moduli space for curves and elliptic curves
13
Galois cohomology of linear groups over local fields
12
Points of a variety defined by Galois descent
12
Why does non-abelian group cohomology exist?
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