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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
Jul
26
answered Can any torsion free abelian group be embedded in a direct sum of copies of $\mathbb Q$?
Apr
16
answered Is vector subtraction commutative?
Apr
16
answered Lie bracket of vector fields and differential of diffeomorphism in its definition
Apr
16
answered There is an orthogonal projection of a subspace onto a canonical subspace that is an isomorphism
Apr
15
answered Does the gradient always point outward of a level surface?
Apr
15
asked There is an orthogonal projection of a subspace onto a canonical subspace that is an isomorphism
Mar
24
asked Does a diffeomorphism between the interiors of two manifolds extend to the manifolds?
Feb
21
answered Best Sets of Lecture Notes and Articles
Feb
5
asked The standard connection in a regular surface is symmetric
Feb
4
asked What does $ds^2$ mean and how does it specify a metric?
Jan
31
asked Is every compact hypersurface contained in a sphere which it touches twice?
Jan
31
answered Any compact embedded $2$-dimensional hypersurface in $\mathbb R^3$ has a point of positive Gaussian curvature
Jan
28
asked Does the gradient always point outward of a level surface?