On small matrix subalgebras with a trivial centralizer
Abstract
Given an integer n greater of equal to 3, we investigate the minimal dimension of a subalgebra of Mn(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.
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