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Nov
22
comment Is the Amitsur-Levitzki identity essentially unique?
... and why "combinatorics"?
Nov
22
comment Is the Amitsur-Levitzki identity essentially unique?
Why this is tagged "commutative algebra"?
Nov
22
revised Is the Amitsur-Levitzki identity essentially unique?
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Nov
22
answered Is the Amitsur-Levitzki identity essentially unique?
Nov
22
revised Powers of finite simple groups
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Nov
22
answered Powers of finite simple groups
Nov
20
comment Normal Covering of a Finite Group
This Corollary 5.5 follows immediately from the theorem of Brodie, Chamberlain and Kapp, PAMS 1988, see Nick Gill's answer: mathoverflow.net/a/185604/24165 .
Nov
9
comment Is the equational theory of commutative vN regular rings decidable?
Thomas, every finitely generated associative commutative ring is residually finite. (For free rings (= polynomial rings), this is almost obvious.)
Nov
9
comment Possible cardinality and weight of an ordered field
Taras, you may write an answer and accept your own answer to make the question "closed".
Nov
9
comment Explicitly showing that a free group is LERF
Surely, there is an algorithm for finding this finite-index subgroup and the free complement in this subgroup. Just look at the proof of Hall's free-factor theorem. It is quite easy using Stallings graphs..
Nov
9
comment Explicitly showing that a free group is LERF
Pablo, every f.g. subgroup $M$ of a f.g. free group $F$ is a free factor of a finite-index subgroup of $F$. So, the problem is reduced to the case where $M$ is a free factor of $F$, where it is quite easy.
Nov
9
comment Fantastic properties of Z/2Z
I added these features, thanks, @Sam.
Nov
9
revised Fantastic properties of Z/2Z
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Nov
9
comment Does the linear automorphism group determine the vector space?
Thanks, @Todd. I corrected the number.
Nov
9
revised Does the linear automorphism group determine the vector space?
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Nov
9
comment Fantastic properties of Z/2Z
@Sam, I bet your single identity forms a basis of identities of the group. (This means that all other identities are consequences of this one.)
Nov
9
revised Does the linear automorphism group determine the vector space?
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Nov
8
revised Does the linear automorphism group determine the vector space?
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Nov
8
answered Does the linear automorphism group determine the vector space?
Nov
3
comment Fantastic properties of Z/2Z
@Denis, of course not. The infinite dihedral group $Z/2Z*Z/2Z$ has elements of infinite order.