3,852 reputation
11345
bio website bruno.stonek.com
location Montevideo, Uruguay
age 24
visits member for 3 years, 6 months
seen 6 hours ago

Math student in Université Paris 13.


Nov
12
accepted If $f^n$ is mixing then $f$ is mixing?
Nov
12
accepted Hartshorne, exercise II.2.18: a ring morphism is surjective if it induces a homeomorphism into a closed subset, and the sheaf map is surjective
Nov
12
accepted Does inclusion of an affine open into an affine scheme correspond to restriction?
Nov
12
asked How to prove that two dilations of $\mathbb R^n$ are conjugate?
Nov
11
answered Criterion for proving flatness
Nov
7
revised What are the most overpowered theorems in mathematics?
added 6 characters in body
Nov
7
answered What are the most overpowered theorems in mathematics?
Nov
7
revised Interpreting results concerning the global sections ring being finitely generated
edited tags
Nov
4
asked Interpreting results concerning the global sections ring being finitely generated
Nov
4
revised If a sequnce $(a_n)_n \to L$, $(\sqrt{a_n})_n \to \sqrt L$
edited tags
Nov
3
comment Does Proj induce some equivalence of categories involving graded rings?
Thank you for your answer. I have not yet studied modules or quasi-coherent things, but when I do I (it should be shortly) I will come back to this.
Nov
3
comment Does inclusion of an affine open into an affine scheme correspond to restriction?
@AlexYoucis: Thanks. I'll keep this in mind. I was also a bit confused by how the correspondence "ring morphisms $\leftrightarrow$ affine scheme morphisms" works. I understand now my question was obvious.
Nov
3
asked Does inclusion of an affine open into an affine scheme correspond to restriction?
Nov
3
revised Can gluing of morphisms of locally ringed spaces be expressed by an exact sequence?
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Nov
3
comment Can gluing of morphisms of locally ringed spaces be expressed by an exact sequence?
Perhaps I should just ditch solution guides to Hartshorne, as suggested in a comment to my previous post...
Nov
3
asked Can gluing of morphisms of locally ringed spaces be expressed by an exact sequence?
Nov
2
comment Hartshorne, exercise II.2.18: a ring morphism is surjective if it induces a homeomorphism into a closed subset, and the sheaf map is surjective
Thanks! I guess I should also be vigilant of solutions I find online. I'm not familiar yet with quasi-coherent things, but when I am I will come back to your message.
Nov
2
revised Hartshorne, exercise II.2.18: a ring morphism is surjective if it induces a homeomorphism into a closed subset, and the sheaf map is surjective
deleted 192 characters in body
Nov
2
asked Hartshorne, exercise II.2.18: a ring morphism is surjective if it induces a homeomorphism into a closed subset, and the sheaf map is surjective
Nov
2
comment Good pairs in Algebraic topology
@Mia: You're welcome! :) You should always make sure to say where a set is open. I believe you were confused by the fact that $V$ is not open in $\mathbb{R}^{n+1}$, a fact that is of no importance here.