Alexander Chervov
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 Mar20 awarded Curious Mar3 asked How many unordered N-seqences in M letter alphabet? Mar31 awarded Popular Question Jun30 comment Reference request for the law of the stopping time in the gambler's ruin problem Jun29 awarded Yearling Jan1 comment What is the trellis diagram for a linear block code? @JyrkiLahtonen Lahtonen Notifier: May I kindly ask you to look at mathoverflow.net/questions/117505/… PS Happy new year ! Dec22 awarded Announcer Sep26 comment Irreps of $S_3=GL(2,2)$. Who is cuspidal? Let be a normal subgroup of a finite group . Let belonging to be a conjugacy class of elements in , and assume that belongs to . Prove that is a union of conjugacy classes in , all having the same cardinality, where equals the index of the group generated by and the centralizer in of and element belonging to . math.stackexchange.com/questions/5614/… Sep26 comment Irreps of $S_3=GL(2,2)$. Who is cuspidal? math.stackexchange.com/questions/153381/… Estimates on conjugacy classes of a finite group. Theorem: Let A be a normal subgroup of G such that A is the centralizer of every non-trivial element in A. If further G/A is abelian, then G has |G:A| linear characters, and (|A|−1)/|G:A| non-linear irreducible characters of degree =|G:A| which vanish off A. math.stackexchange.com/questions/117500/… Sep26 comment Irreps of $S_3=GL(2,2)$. Who is cuspidal? Side remark: Have a look at Weintraub - "Representation theory of finite group" in the section Mackey Machine math.stackexchange.com/questions/38571/… What is the relationship between Mackey's theorem in character theory and Mackey's theorem in transfer theory? math.stackexchange.com/questions/189430/… Sep15 comment Conjugacy classes in group extensions Thank you !... . Sep11 comment Conjugacy classes in group extensions May I ask you? Is more strong thing holds : preimage of conj class in G/N is not more than k(N) conj. classes ? Then inequality follows obviously, if we have G = N x G/N then it is of course so, for preimage "id" it is also of course so Aug15 comment Irreps of $S_3=GL(2,2)$. Who is cuspidal? Thank you very much! Aug15 accepted Irreps of $S_3=GL(2,2)$. Who is cuspidal? Aug15 comment Kindle as a Tool for Mathematicians? May I kindly ask you to look at my question: math.stackexchange.com/questions/182724/… this is notifier I will delete it later. Aug15 asked Irreps of $S_3=GL(2,2)$. Who is cuspidal? Aug13 comment Construction of representations @PeteL.Clark What is the list of other examples known ? Where can I take it ? I am googling for quite a long, but do not see comprehensive answer :( Aug1 comment Voyager mission polynomials. Prove that for any $p(x)$ $|p(x)(1+x+x^3+x^4+x^6)|+|p(x)(1+x^3+x^4+x^5+x^6)|\geq10$, where $|\cdot|$ number of monoms @DilipSarwate Thank you for yours comments ! Probably a part of my question is complicated and may be NP, but there is the following YES/NO sub-question: Is it true that Max_{f,g, deg = n} MinDist(f,g) > n ? I think yes, what is sharper bound ? may be n +log(n) or n+sqrt(n) ? What is known about it ? Aug1 comment Voyager mission polynomials. Prove that for any $p(x)$ $|p(x)(1+x+x^3+x^4+x^6)|+|p(x)(1+x^3+x^4+x^5+x^6)|\geq10$, where $|\cdot|$ number of monoms @DilipSarwate Thank you for yours comment. May be you right, exercise a bad word, may be complicated puzzle is better... What is not quite clear for me about "no easy answers or proofs, and no useful bounds " is that - is it known that any bound will be complicated or just this is open problem to find good bound ? E.g. may I ask you to look at mathoverflow.net/questions/103497/… any comments are welcome ! Aug1 comment Voyager mission polynomials. Prove that for any $p(x)$ $|p(x)(1+x+x^3+x^4+x^6)|+|p(x)(1+x^3+x^4+x^5+x^6)|\geq10$, where $|\cdot|$ number of monoms @joriki Thank you ! It is more clear now.