Godsil-McKay switching and twisted Grassmann graphs
arXiv:1512.09232 · doi:10.1007/s10623-016-0244-1
Abstract
We show that the twisted Grassmann graphs introduced by Van Dam and Koolen are obtained by Godsil-McKay switching applied to the Grassmann graphs. The partition for the switching is constructed by a polarity of a hyperplane.
7 pages, minor revision