Kähler-group conjecture for mapping class groups

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For g≥3g\geq 3, let Modg{\rm Mod}_g be the mapping class group of a closed genus-gg surface. Kähler-group conjecture. The group Modg{\rm Mod}_g is a Kähler group, meaning that it is isomorphic to the fundamental group of a compact Kähler manifold. The source calls this a folklore conjecture and says it was not known there; the supplied status evidence records that it is now disproved, because finite extensions reduce to pure braid groups, which are iterated extensions of free groups and are not Kähler.

References

Primary source

Benson Farb, “Some problems on mapping class groups and moduli space”, arXiv:math/0606432 (2006).

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