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arXiv · 2611.06081

On the Cameron-Praeger conjecture for Steiner 6-designs

Ximin Wang·Zheng Huang·Weijun Liu
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Abstract

A long-standing and far-reaching conjecture of Cameron and Praeger (1993) asserts that no non-trivial block-transitive $6$-$(v,k,λ)$ designs exist. Huber (2010) reduced the Steiner case ($λ=1$) to a single infinite family of possible exceptions, where the automorphism group is $G=\PGaL(2,p^e)$ acting on the points of the projective line, with $p\in\{2,3\}$ and $e$ an odd prime power. In this paper, we resolve this final case. By combining orbit-stabiliser analysis for the action of specific involutions in $\PGaL(2,p^e)$ with the modular arithmetic constraints derived from the design parameters, we prove that no such Steiner 6-designs can exist for any admissible $q$. This completes the proof that the Cameron-Praeger conjecture is true for the important case of non-trivial Steiner 6-designs.

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Ximin Wang, Zheng Huang, Weijun Liu. 2026-11-04. On the Cameron-Praeger conjecture for Steiner 6-designs. https://arxiv.org/abs/2611.06081

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