WOW-284 fails on explicit graphs of orders 38,39,40,42,50; regular strict counterexamples need degree ≥6 and diameter ≤4, with exact LP order bounds and Hoffman–Singleton deletion radius five.
Distance spectra of graphs: A survey.Linear Algebra and its Applications, 458:301–386, 2014
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Counterexamples, Spectral Obstructions, and Deletion Stability for WOW-284
WOW-284 fails on explicit graphs of orders 38,39,40,42,50; regular strict counterexamples need degree ≥6 and diameter ≤4, with exact LP order bounds and Hoffman–Singleton deletion radius five.