When is the commutant of a Bol loop a subloop?

Details When is the commutant of a Bol loop a subloop? When is the commutant of a Bol loop a subloop?

2006-01-14

arxiv.org/abs/math/0601363v2

Trans. Amer. Math. Soc. 360 (2008), no. 5, 2393-2408

Mathematics

Group Theory

16 pages, 12 pt

Scientific paper

A left Bol loop is a loop satisfying $x(y(xz)) = (x(yx))z$. The commutant of a loop is the set of elements which commute with all elements of the loop. In a finite Bol loop of odd order or of order $2k$, $k$ odd, the commutant is a subloop. We investigate conditions under which the commutant of a Bol loop is not a subloop. In a finite Bol loop of order relatively prime to 3, the commutant generates an abelian group of order dividing the order of the loop. This generalizes a well-known result for Moufang loops. After describing all extensions of a loop $K$ such that $K$ is in the left and middle nuclei of the resulting loop, we show how to construct classes of Bol loops with non-subloop commutant. In particular, we obtain all Bol loops of order 16 with non-subloop commutant.

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