The asymptotic-dimension conjecture for the mapping class group
The asymptotic-dimension conjecture for the mapping class group
Let be the finite-type surface under consideration, of genus , and let denote its mapping class group. Write for its asymptotic dimension and for its virtual cohomological dimension.
Asymptotic-dimension conjecture.
This conjecture, attributed to Bestvina and Bromberg, predicts that the asymptotic dimension of the mapping class group equals its virtual cohomological dimension, with both given by . The surrounding results provide support for the conjecture, but the supplied text does not state that it has been resolved.
Sources & referencesView supporting material
Primary source
Ursula Hamenstädt, “An EZ-structure for the mapping class group”, arXiv:2505.18808 (2026).
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