September 2017 October 2017 November 2017 Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 1 2 3 4 5 6 7 1 2 3 4 3 4 5 6 7 8 9 8 9 10 11 12 13 14 5 6 7 8 9 10 11 10 11 12 13 14 15 16 15 16 17 18 19 20 21 12 13 14 15 16 17 18 17 18 19 20 21 22 23 22 23 24 25 26 27 28 19 20 21 22 23 24 25 24 25 26 27 28 29 30 29 30 31 26 27 28 29 30 |

4:00 pm Monday, October 23, 2017 Topology Seminar: Free products in Diff(S^1)by Sam Kim (Seoul National University) in HBH 427- We prove that the class of subgroups of Diff^r(S^1) is not closed under taking free products for each 2<= r <=infinity. More specifically, if G is finitely generated non-virtually-abelian group, then (G x Z) * Z does not embed into Diff^r(S^1). We then complete the classification of RAAGs embeddable in Diff^r(S^1), answering a question of Kharlamov (in a paper of M. Kapovich). This is a joint work with Thomas Koberda.
Submitted by neil.fullarton@rice.edu |