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Apr
30
reviewed Reviewed List comparison
Apr
29
reviewed Close proof that ${\rm SL}_n (R)=E_n(R)$ in a local ring?
Apr
29
reviewed Close Reflexive sheaf and torsion free sheaf
Apr
26
awarded  Nice Answer
Apr
15
awarded  Good Answer
Apr
13
comment Number of free summands of finite local extensions
Excellent! (I secretly hope they don't exist in general).
Apr
13
asked Number of free summands of finite local extensions
Mar
23
comment invariants that can be measured by Local Cohomology
I'm not really sure what you are looking for, are you only looking at things relative to maps. I could give you a long list of properties of rings commonly measured by local cohomology (like depth and dimension...) On the other hand, the complex $R \Gamma_m(R)$ is Matlis dual to the dualizing complex, so you can measure any property you could measure from the cohomology of the dualizing complex, which a huge number of properties.
Mar
1
answered If $X$ has non-singular normalization $\dim (\mathrm{Sing(X)})=\dim (X)-1$?
Mar
1
comment If $X$ has non-singular normalization $\dim (\mathrm{Sing(X)})=\dim (X)-1$?
It can't, the S2 requirement on the hypersurface actually forces the conductor ideal to be pure codimension 1. I'll explain in an answer.
Feb
25
reviewed Leave Open Morphisms with connected fibres and rational functions
Jan
29
reviewed Leave Open Is there a t-structure on the homotopy category of spectra that has the sphere spectrum in its heart?
Jan
25
awarded  Yearling
Jan
3
reviewed Leave Open Is $n=6$ the only integer satisfies ${\sigma}_x(n) \equiv 0\bmod{n}$ for every odd integer $x > 0$ and $2 (\bmod n)$ if $x$ is even integer?
Jan
3
reviewed Leave Open On compact, orientable 3-manifolds with non-empty boundary
Jan
3
reviewed Close equality of expressions for sum
Dec
12
comment Non-vanishing of a higher direct image
Also, what do you know about $C$?
Dec
12
comment Non-vanishing of a higher direct image
Is $X$ smooth or at least mildly singular (rational singularities)?
Dec
8
reviewed Close VC dimension of infinite cones
Dec
3
reviewed Close Decompose $\Lambda^3(V \otimes W)$