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math.GT2021★ 6 cited
Mapping class groups of simply connected high-dimensional manifolds need not be arithmetic
Manuel Krannich, Oscar Randal-Williams
It is well known that Sullivan showed that the mapping class group of a simply connected high-dimensional manifold is commensurable with an arithmetic group, but the meaning of "co…
math.GT2021
On Torelli groups and Dehn twists of smooth 4-manifolds
Manuel Krannich, Alexander Kupers
This note has two related but independent parts. Firstly, we prove a generalisation of a recent result of Gay on the smooth mapping class group of . Secondly, we give an alter…