Indecomposable racks of order p^2

Details Indecomposable racks of order p^2 Indecomposable racks of order p^2

2002-03-15

arxiv.org/abs/math/0203157v1

Mathematics

Quantum Algebra

8 pages

Scientific paper

We classify indecomposable racks of order p^2 (p a prime). There are 2p^2 - 2p - 2 isomorphism classes, among which 2p^2 - 3p - 1 correspond to quandles. In particular, we prove that an indecomposable quandle of order p^2 is affine (=Alexander). One of the results yielding this classification is the computation of the quandle nonabelian second cohomology group of an indecomposable quandle of prime order; which turns out to be trivial, as in the abelian case.

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