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On the number and sizes of double cosets of Sylow subgroups of the symmetric group

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arxiv 2504.01149 v1 pith:2QGG2R7Y submitted 2025-04-01 math.GR

On the number and sizes of double cosets of Sylow subgroups of the symmetric group

classification math.GR
keywords cosetsdoublesizesgroupnumbersylowsymmetricwhen
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Let $P_n$ be a Sylow $p$-subgroup of the symmetric group $S_n$. We investigate the number and sizes of the $P_n\setminus S_n\ /\ P_n$ double cosets, showing that most double cosets have maximal size when $p$ is odd, or equivalently, that $P_n\cap P_n^x=1$ for most $x\in S_n$ when $n$ is large. We also find that all possible sizes of such double cosets occur, modulo a list of small exceptions.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. On the sizes of the maximal prime powers divisors of factorials

    math.NT 2026-01 conditional novelty 6.0

    For sufficiently large n, the maximal p-power divisor of n! dominates the maximal q-power divisor for every q > p; for twin primes the exact threshold is (p^2+p)/2.

  2. On the sizes of the maximal prime powers divisors of factorials

    math.NT 2026-01 unverdicted novelty 5.0

    For any prime p there exists n0(p) such that p to the power of its factorial valuation exceeds that of every larger prime q for all n at or above n0, and for twin primes the smallest such n0 is exactly p(p+1)/2.