Ivanov's presentation conjecture for power subgroups of mapping class groups

Let Σg\Sigma_g be a closed surface of genus gg, let MgM_g be its mapping class group, and let Mg[D]M_g[D] be the subgroup generated by the DD-th powers of Dehn twists about all simple closed curves. Let SCCgSCC_g be the infinite set of simple closed curves on Σg\Sigma_g, and write TaT_a for the Dehn twist about aa. Ivanov's presentation conjecture. For D3D\geq 3, g4g\geq 4 or D4D\geq 4, g{2,3}g\in\{2,3\}, the group Mg[D]M_g[D] has a presentation with generators ZaZ_a, corresponding to TaDT_a^D for aSCCga\in SCC_g, and relations

ZTaD(b)=ZaZbZa1Z_{T_a^D(b)}=Z_a Z_b Z_a^{-1}

for every pair a,bSCCga,b\in SCC_g. This is a proposed presentation by braid-type relations, motivated by a question of Ivanov about relations among powers of Dehn twists.

Sources & referencesView supporting material

Primary source

Louis Funar, “On power subgroups of mapping class groups”, arXiv:0910.1493 (2014).

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