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- 31 votes cast
Nov
16 |
comment |
Open affine subscheme of affine scheme which is not principal
I agree it is not clear why $D(X,Y)$ is not principal. Also the role of $U$ and $V$ is not clear: can you take $U=V=1$ ? |
Oct
21 |
comment |
When is the flatness locus non-empty
The question becomes interesting when you do not assume that $Y$ is reduced... |
Oct
8 |
accepted | In a noetherian commutative ring with only one associated prime, is the nilradical locally free? |
Oct
8 |
comment |
In a noetherian commutative ring with only one associated prime, is the nilradical locally free?
Thank you Eric. Your answer deserves acceptation although my question was silly. |
Oct
8 |
comment |
In a noetherian commutative ring with only one associated prime, is the nilradical locally free?
All right, I see I'm a bit messed up. I have to think about it a bit more. |
Oct
7 |
comment |
In a noetherian commutative ring with only one associated prime, is the nilradical locally free?
you are absolutely right that my question is nonsense. I guess that what I have in mind is something along the following lines : if X is a scheme of finite type over a field, and N is the sheaf of nilpotent regular functions, then the dimension d(x)=dim_k(N_x)=_dim_k(Nil(O_{X,x})) is finite, and in case X has only one associated point, the function d should be constant. Does that make sense to you ? |
Oct
7 |
asked | In a noetherian commutative ring with only one associated prime, is the nilradical locally free? |
Sep
30 |
answered | Scheme of irreducible components |
Aug
25 |
comment |
Reference for the statement that the complement of an affine open has codimension one
EGA IV, part 4 (IHES no 32), Cor. 21.12.7. |
Aug
18 |
comment |
Relationship between $N_{A/K}$ and the reduced norm $\text{nr}_{A/k}$?
Well, not every finite-dimensional algebra is central simple. |
Jun
21 |
answered | meaning of $k$-rational for closed subschemes |
Jun
18 |
accepted | Book on the tetrahedron |
Jun
18 |
comment |
Book on the tetrahedron
Indeed there is a way - I'll buy the book and see. |
Jun
18 |
comment |
Book on the tetrahedron
Seems interesting indeed... |
Jun
18 |
comment |
Book on the tetrahedron
Yes, that's the website of the publisher in Zagreb, Croatia. I sent a mail there to see if there is a way to buy the book. Thanks, |
Jun
18 |
comment |
Book on the tetrahedron
Thank you! These books seem interesting, especially the first. Now comes the question: how can I put my hands on it? It's not in my local library and I can't even seem to find it for sale somewhere on the web... |
Jun
17 |
asked | Book on the tetrahedron |
May
7 |
comment |
When is the Hom-scheme connected?
No, your functor is not representable by a scheme, already e.g. for $A=B=k[X]$. |
May
6 |
awarded | Yearling |
Apr
17 |
comment |
Reference for a lemma on étale maps
With all due respect to the Stacks Project, it is not peer-reviewed... |