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Mar
14
asked If a morphism of pushouts of complexes (with one arrow monic) is composed of quasi-isos, then the induced arrow is one also
Feb
7
asked The groups $[\Sigma^nX,Y]$ versus the homotopy groups
Jan
31
asked Homology with local coefficients in a $\mathbb{Z}[\pi_1(X)]$-module
Dec
26
asked When are generalized Severi-Brauer varieties trivial?
Nov
26
asked Is an integer a sum of two rational squares iff it is a sum of two integer squares?
Nov
26
answered Every 4-dimensional isotropic quadratic space of determinant 1 is hyperbolic
Nov
21
asked Every 4-dimensional isotropic quadratic space of determinant 1 is hyperbolic
Nov
14
answered In a complete perfect metric space, transitive distance-preserving maps are minimal
Nov
13
asked In a complete perfect metric space, transitive distance-preserving maps are minimal
Nov
12
asked How to prove that two dilations of $\mathbb R^n$ are conjugate?
Nov
11
answered Criterion for proving flatness
Nov
7
answered What are the most overpowered theorems in mathematics?
Nov
4
asked Interpreting results concerning the global sections ring being finitely generated
Nov
3
asked Does inclusion of an affine open into an affine scheme correspond to restriction?
Nov
3
asked Can gluing of morphisms of locally ringed spaces be expressed by an exact sequence?
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
answered Good Pairs in Algebraic Topology
Nov
1
asked Does Proj induce some equivalence of categories involving graded rings?
Oct
31
asked If $f^n$ is mixing then $f$ is mixing?
Aug
19
answered Construction of a Hausdorff space from a topological space