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user2035
  • Member for 14 years, 4 months
  • Last seen more than 10 years ago
45 votes
Accepted

Affine scheme on spec(A) of a ring A as the sheafification of a pre-sheave on spec(A)?

28 votes
Accepted

Hom(A,C) ⊗ Hom(B,D) injects into Hom(A⊗B,C⊗D): when? why?

25 votes
Accepted

Why is the identity element of a group denoted by $e$?

14 votes

Existence of projective resolutions in abelian categories

14 votes
Accepted

For any $n$, does there exist a number field with at least $n$ solutions to the unit equation

11 votes

Is $H^i(X,F)$ finitely generated over $\Gamma(O_X)$ if $F$ is coherent?

10 votes

reduced ⊗ reduced = reduced; what about connected?

10 votes
Accepted

two conjugate subgroups and one is a proper subset of the other? plus, a covering space interpretation.

10 votes
Accepted

Endomorphisms of vector bundles

8 votes
Accepted

Does every nontrivial sheaf of rings have a maximal ideal?

8 votes
Accepted

Counter-examples to Krull's intersection theorem

8 votes
Accepted

Does a regular pair of elements in a noetherian domain remain regular if their order is switched?

8 votes
Accepted

degree 0 vector bundles

7 votes
Accepted

Ultraproduct $\prod_p \mathbb{F}_p/\sim$ and $\mathbb{Q}^*$

7 votes
Accepted

Do the solutions to the unit equation lie dense in the complex numbers

7 votes
Accepted

Is tensor product of local algebras local?

6 votes

Is the support of an Artinian module finite?

6 votes

Line bundles on fibrations

6 votes
Accepted

Quotient of flat module is flat - a property in Mumford's Red book

5 votes

Can different modules have the same symmetric algebra? (answered: no)

5 votes

Are injective quasi-coherent modules acyclic?

5 votes
Accepted

References to SGA 8 and descent theory

5 votes
Accepted

Is a reduced, torsion-free module of finite rank over an Henselian ring free?

5 votes
Accepted

Infinite products of representations of the additive group

4 votes
Accepted

Proper morphism sending coherent to coherent

4 votes
Accepted

not locally of finite type implies not universally closed?

4 votes

flatness condition for local noetherian ring without nilpotent elements

4 votes

Are two sheaves that are locally isomorphic globally isomorphic ?

4 votes
Accepted

On the functoriality of scalar extensions of local rings (edited)

4 votes
Accepted

Question on a projective bundle associated to a vector bundle