Super Hayashi Quandles

TL;DR

This paper introduces Super Hayashi Quandles (SHQ), a special class of finite connected quandles with unique profile properties, and proves their structural characteristics and existence of infinitely many examples.

Contribution

It defines SHQ as a new class of quandles with specific profile divisibility properties and establishes their structural features and infinite existence.

Findings

SHQ's are latin quandles with profiles depending only on the second shortest length and number of cycles.

SHQ's have subquandles with the same second shortest length but fewer cycles.

Infinitely many SHQ's are constructed.

Abstract

Quandles are right-invertible, right-self distributive (and idempotent) algebraic structures. Therefore, right translations are quandle automorphisms. It has been interesting to look into finite quandles by way of the cycle structures their right translations may have. For each quandle, the list of these cycle structures is known as the profile of the quandle. For a connected quandle, any two right translations are conjugate so there is essentially one cycle structure per connected quandle - which we thus identify with the profile. Hayashi conjectured that, for a connected quandle, each length of its profile divides the longest length. In the present article we introduce Super Hayashi Quandles (SHQ). An SHQ is a finite connected quandle such that any two lengths in its profile are (i) distinct, and (ii) the shorter one divides the longer one. The SHQ's are latin quandles and we prove that their profiles depend only on the second shortest length and on the number of cycles. Furthermore, we prove that SHQ's have SHQ's alone for subquandles (with the same second shortest length but fewer cycles). Finally, we construct infinitely many SHQ's.