Galkin Quandles, Pointed Abelian Groups, and Sequence $A000712$

Details Galkin Quandles, Pointed Abelian Groups, and Sequence $A000712$ Galkin Quandles, Pointed Abelian Groups, and Sequence $A000712$

2011-08-10

arxiv.org/abs/1108.2215v1

Mathematics

Combinatorics

7 pages, 2 figures

Scientific paper

For each pointed abelian group $(A,c)$, there is an associated {\em Galkin quandle} $G(A,c)$ which is an algebraic structure defined on $\Bbb Z_3\times A$ that can be used to construct knot invariants. It is known that two finite Galkin quandles are isomorphic if and only if their associated pointed abelian groups are isomorphic. In this paper we classify all finite pointed abelian groups. We show that the number of nonisomorphic pointed abelian groups of order $q^n$ ($q$ prime) is $\sum_{0\le m\le n}p(m)p(n-m)$, where $p(m)$ is the number of partitions of integer $m$.

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