A two-fold cover of strongly regular graphs with spreads and association schemes of class five

Abstract

We consider imprimitive association schemes of class four which are two-fold covers of strongly regular graphs with spreads. It will be shown that a two-fold cover of a strongly regular graph with a spread provides a five class fission scheme of the imprimitive scheme of class four.

References in corpus (1)

• On antipodal spherical t-designs of degree s with $t\ge 2s-3$