2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/168034Given a matrix over a skew field fixing the column (1,...,1)^t, we give formulas for a row vector fixed by this matrix. The same techniques are applied to give noncommutative extensions of probabilistic properties of codes.24 pages, LatexRings and AlgebrasInformation Theory16K40, 15A51, 94A45text