Proves K4 exists in derangement graphs of transitive groups with degree >30, implying |G:U|≤10 for normal G in A with |A:G|=3 under union-of-conjugates condition, supporting Neumann-Praeger conjecture.
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Kronecker classes and cliques in derangement graphs
Proves K4 exists in derangement graphs of transitive groups with degree >30, implying |G:U|≤10 for normal G in A with |A:G|=3 under union-of-conjugates condition, supporting Neumann-Praeger conjecture.