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Nov 22 
comment 
Is the AmitsurLevitzki identity essentially unique?
Your last paragraph can be expressed succintly using the notion of Tideals. 
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?
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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 qvariants
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! 
Nov 7 
comment 
Does the linear automorphism group determine the vector space?
What do you mean by «size» of $GL(V)$ in the finite dimensional case? The center of the group is isomorphic to the multiplicative group of the field, but this is not enough to tell the fields apart in the infite case. 
Nov 7 
reviewed  Approve suggested edit on Unseparability of two linked rings in higher dimensions 
Nov 6 
comment 
Complement for Jacobson radical
If $R$ contains a field (which will be finite, hence perfect), then this follows from Wedderburn's Principal Theorem. Hrm. Actually: do you mean that the ring is of prime power order or that the identity element is of prime power order? 
Nov 6 
comment 
When did “Betti cohomology” come to be used the way it is today? (and how is it used)
@ThiKu, do you have the reference to the CRAS paper? 
Nov 5 
comment 
Natural associative law for a ternary “group”?
Loday discusses «totally associative algebras» (with an $n$ary operation) which satisfy exactly those relations in his book about algebraic operads. 
Nov 4 
comment 
Localized J homomorphism
Please use $...$ to get your math to be processed.

Nov 3 
comment 
Recent, elementary results in algebraic geometry
The tensor decomposition thingie has very practical connections to algorithms, too, through the Strassen algorithm. 