Rules of Three for commutation relations
arXiv:1608.05042
Abstract
We investigate the following surprisingly widespread phenomenon which we call The Rule of Three: in order for a particular kind of commutation relation to hold for subsequences of elements of a ring labeled by any subset of indices, it is enough that these relations hold for subsets of size one, two, and three.
23 pages, 5 figures. Version 2: minor changes, final version to appear in Journal of Algebra