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Dec
16
comment Defining the cup product in Ext using a Kunneth formula
The cup product is just the composition of maps in the derived category. If you want to actually compute, that's not very helpful, though.
Dec
13
awarded  Nice Answer
Dec
12
awarded  Great Answer
Dec
12
awarded  Popular Question
Dec
11
comment The Euler characteristic of Hilbert series
Knot theory people use «graded Euler characteristic» if I recall correctly, but it seems restricted to that crowd.
Dec
11
asked The Euler characteristic of Hilbert series
Dec
6
comment Higher Homotopy Groups
That we do have a map follows from the celebrated Theorem on The Existence Of Constant Maps.
Nov
22
comment Is the Amitsur-Levitzki identity essentially unique?
Your last paragraph can be expressed succintly using the notion of T-ideals.
Nov
21
comment Rigid nilpotent Lie algebras
The condition by Carles is on any lie algebra or on nilpotent ones?
Nov
18
revised Is there a natural way to view the proof of Hilbert 90?
added 71 characters in body
Nov
18
comment Cohomology of SL(2,R) with coefficients given by linear action
You are looking at $SL_2(\mathbb R)$ as a discrete group?
Nov
17
revised Is there a natural way to view the proof of Hilbert 90?
added 78 characters in body
Nov
17
answered Is there a natural way to view the proof of Hilbert 90?
Nov
12
comment Two rings…are they isomorphic?
@NicholasProudfoot, please do revert the edit and ask another question.
Nov
11
comment The properness of a submersion
Please if after some time you do not get an answer in math.stackexchange.com it can be sensible to reask here, but always provide links to the other question in both sides, and please do not delete questions which have answers on which other users have spent time and energy.
Nov
11
comment The properness of a submersion
This has been asked also at math.stackexchange.com/questions/1004543/… (and then deleted by the OP; but I undeleted it)
Nov
8
comment Role of determinant of the matrix corresponding to $i$-th Homology group.
Well, that is very greatly explained in GKZ :-)
Nov
8
comment Role of determinant of the matrix corresponding to $i$-th Homology group.
Determinants of complexes and of maps of complexes (and these are 'alternating products") are useful in several contexts. See the book of Gelfand, Kapranov and Zelevinski for information, for example.
Nov
8
revised Derangements and q-variants
deleted 130 characters in body
Nov
7
comment Aronszajn measure
«Of course»? Well, it could have meant Greenwich Mean Time and all sort of other things. It is never a good idea to have the third word of anything one writes be an accronym unless the audience is very, very limited. In any case, what does make me curious is if you asked this question to your professor right after googling and finding nothing!