4,106 reputation
21647
bio website bruno.stonek.com
location Montevideo, Uruguay
age 25
visits member for 3 years, 9 months
seen yesterday

Math student in Université Paris 13.


Jun
17
accepted On pushouts and mapping cylinders in exact categories
Jun
9
accepted Is $\Omega \tilde X \simeq \Omega_0 X$?
May
1
accepted What does $ds^2$ mean and how does it specify a metric?
May
1
accepted Interpreting results concerning the global sections ring being finitely generated
Apr
15
accepted When are generalized Severi-Brauer varieties trivial?
Apr
10
accepted If a morphism of pushouts of complexes (with one arrow monic) is composed of quasi-isos, then the induced arrow is one also
Feb
21
accepted Is an integer a sum of two rational squares iff it is a sum of two integer squares?
Dec
10
accepted Every 4-dimensional isotropic quadratic space of determinant 1 is hyperbolic
Dec
10
accepted In a complete perfect metric space, transitive distance-preserving maps are minimal
Nov
21
accepted How to prove that two dilations of $\mathbb R^n$ are conjugate?
Nov
12
accepted Does Proj induce some equivalence of categories involving graded rings?
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?
Jun
27
accepted There is an orthogonal projection of a subspace onto a canonical subspace that is an isomorphism
Apr
15
accepted Is every compact hypersurface contained in a sphere which it touches twice?
Apr
15
accepted Does the gradient always point outward of a level surface?
Apr
15
accepted Does a diffeomorphism between the interiors of two manifolds extend to the manifolds?
Feb
2
accepted Characterizations of the $p$-Prüfer group
Nov
24
accepted Freyd-Mitchell's embedding theorem