The no-genus-bound automorphism conjecture for complexes of regions

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Let SgS_g be a closed surface of genus gg, and let CA(Sg)\mathcal C_A(S_g) be a complex of regions that is connected and has no holes or corks. Complex-of-regions conjecture. The natural map

MCG⁡(Sg)⟶Aut⁡CA(Sg)\operatorname{MCG}(S_g)\longrightarrow\operatorname{Aut}\mathcal C_A(S_g)

is an isomorphism. This removes the hypothesis g≥3gˉ(A)+1g\geq3\bar g(A)+1 from the authors' theorem; the excerpt gives no resolution of the conjecture.

References

Primary source

Tara Brendle and Dan Margalit, “Normal subgroups of mapping class groups and the metaconjecture of Ivanov”, arXiv:1710.08929 (2018).

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