Oliver's Schur multiplier conjecture for saturated fusion systems

Let F\mathcal F be a saturated fusion system and let L\mathcal L be its associated centric linking system. The Schur multiplier of F\mathcal F is the group associated to the kernel of the canonical morphism μL\mu_{\mathcal L}, and ker(μL)\ker(\mu_{\mathcal L}) denotes that kernel.

Oliver's Schur multiplier conjecture. ker(μL)\ker(\mu_{\mathcal L}) is isomorphic to a subgroup of the Schur multiplier of F\mathcal F.

This extends an open question of Oliver asking whether μL\mu_{\mathcal L} is injective for fusion systems arising from finite 22-perfect groups whose Schur multiplier has odd order. The source presents the assertion as an open question related to the paper's results.

Sources & referencesView supporting material

Primary source

Jonathon Villareal, “Rigid automorphisms of linking systems of finite groups of Lie type”, arXiv:2509.21139 (2026).

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