Design switching on graphs
Combinatorics
2025-08-18 v1
Abstract
We show that each (r, lambda)-design yields a class of switching methods that can be used produce cospectral graphs. We use this to explain several specific switching methods such as Godsil-McKay (GM) switching and Wang-Qiu-Hu (WQH) switching.
Cite
@article{arxiv.2508.11523,
title = {Design switching on graphs},
author = {Ferdinand Ihringer and Robin Simoens},
journal= {arXiv preprint arXiv:2508.11523},
year = {2025}
}