Geometry & Topology
- Geom. Topol.
- Volume 12, Number 1 (2008), 97-101.
Addendum to: Commensurations of the Johnson kernel
Let be the subgroup of the extended mapping class group, , generated by Dehn twists about separating curves. In our earlier paper, we showed that when is a closed, connected, orientable surface of genus . By modifying our original proof, we show that the same result holds for , thus confirming Farb’s conjecture in all cases (the statement is not true for ).
Geom. Topol., Volume 12, Number 1 (2008), 97-101.
Received: 13 September 2007
Accepted: 12 October 2007
First available in Project Euclid: 20 December 2017
Permanent link to this document
Digital Object Identifier
Mathematical Reviews number (MathSciNet)
Zentralblatt MATH identifier
Primary: 20F36: Braid groups; Artin groups
Brendle, Tara E; Margalit, Dan. Addendum to: Commensurations of the Johnson kernel. Geom. Topol. 12 (2008), no. 1, 97--101. doi:10.2140/gt.2008.12.97. https://projecteuclid.org/euclid.gt/1513800014