Hayashi's cycle-divisibility conjecture for finite indecomposable quandles

A finite rack XX has profile 1m0l1m1l2m2lkmk1^{m_0}l_1^{m_1}l_2^{m_2}\cdots l_k^{m_k} when its inner automorphism has m0m_0 cycles of length 11, m1m_1 cycles of length l1l_1, and so on. Hayashi's conjecture. Let XX be a finite indecomposable rack with profile

1m0l1m1l2m2lkmk.1^{m_0}l_1^{m_1}l_2^{m_2}\cdots l_k^{m_k}.

Then lilkl_i\mid l_k for every integer ii with 1ik11\leq i\leq k-1. This conjecture concerns restrictions on the cycle lengths of inner automorphisms of finite indecomposable racks and extends Hayashi's proposed statement for finite connected quandles. The source verifies some cases but does not establish the conjecture in general.

Sources & referencesView supporting material

Primary source

Naqeeb ur Rehman, “On the Cycle Structure of Finite Racks and Quandles”, arXiv:1912.05115 (2019).

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