A. Oller-Marcén
Centro Universitario de la Defensa de Zaragoza. Carretera de Huesca s/n, 50090 Zaragoza, Spain.
[ 1 ] - On the diameter of the commuting graph of the full matrix ring over the real numbers
In a recent paper C. Miguel proved that the diameter of the commuting graph of the matrix ring $mathrm{M}_n(mathbb{R})$ is equal to $4$ if either $n=3$ or $ngeq5$. But the case $n=4$ remained open, since the diameter could be $4$ or $5$. In this work we close the problem showing that also in this case the diameter is $4$.
Co-Authors
C. Tasis 1