On small matrix subalgebras with a trivial centralizer
arXiv:1001.3995 · doi:10.1080/03081087.2010.511212
Abstract
Given an integer n greater of equal to 3, we investigate the minimal dimension of a subalgebra of M_n(K) with a trivial centralizer. It is shown that this dimension is 5 when n is even and 4 when it is odd. In the latter case, we also determine all 4-dimensional subalgebras with a trivial centralizer.
arXiv comment15 pages (some corrections from v1, one proof has been fixed)