August 2011 September 2011 October 2011 Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa 1 2 3 4 5 6 1 2 3 1 7 8 9 10 11 12 13 4 5 6 7 8 9 10 2 3 4 5 6 7 8 14 15 16 17 18 19 20 11 12 13 14 15 16 17 9 10 11 12 13 14 15 21 22 23 24 25 26 27 18 19 20 21 22 23 24 16 17 18 19 20 21 22 28 29 30 31 25 26 27 28 29 30 23 24 25 26 27 28 29 30 31 |

1:00 pm Tuesday, September 20, 2011 VIGRE TOPOLOGY SEMINAR: On the signatures of even 4-manifoldsby Arunima Ray (Rice University) in HB 427- I will present a proof (from the above paper) that every connected, closed, oriented 4-manifold with even intersection form has a finite cyclic cover which is spin, and a Z_2 version of Furuta's theorem which holds for non-spin 4-manifolds with even intersection form.
Submitted by cochran@rice.edu |