The Second Subconstituent of some Strongly Regular Graphs

Details The Second Subconstituent of some Strongly Regular Graphs The Second Subconstituent of some Strongly Regular Graphs

2010-02-28

arxiv.org/abs/1003.0175v1

Mathematics

Combinatorics

9 pages

Scientific paper

This is a report on a failed attempt to construct new graphs that are strongly regular with no triangles. The approach is based on the assumption that the second subconstituent has an equitable partition with four parts. For infinitely many odd prime powers we construct a graph that is a plausible candidate for the second subconstituent. Unfortuantely we also show that the corresponding graph is strongly regular only when the prime power is 3, in which case the graph is already known.

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