The enumeration conjecture for medial racks and quandles of prime order

Let pp be a prime. Write rmed(p)r_{\emph{med}}(p) and qmed(p)q_{\emph{med}}(p) for the numbers of medial racks and medial quandles of order pp, respectively, and r_{\emph{2-red}}(p) and q_{\emph{2-red}}(p) for the numbers of 22-reductive racks and 22-reductive quandles of order pp, respectively.

Enumeration conjecture.

rmed(p)r2-red(p)=p2r_{\emph{med}}(p)-r_{\emph{$2$-red}}(p)=p-2

and

qmed(p)q2-red(p)=p2.q_{\emph{med}}(p)-q_{\emph{$2$-red}}(p)=p-2.

In particular, every medial rack of order pp that is not 22-reductive is a quandle.

This conjecture is supported by the authors' computational data and concerns the enumeration of medial racks and quandles of prime order. Its resolution would also establish the stated structural consequence for medial racks that are not 22-reductive.

Sources & referencesView supporting material

Primary source

Petr Vojtěchovský and Seung Yeop Yang, “Enumeration of racks and quandles up to isomorphism”, arXiv:1911.04991 (2019).

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