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**Next talk(s):**

**Speaker:** Ahmad Issa (U.T. Austin)

**Title:** Embedding Seifert fibered spaces in the 4-sphere

**Abstract:** Which 3-manifolds smoothly embed in the 4-sphere? This seemingly simple question turns out to be surprisingly subtle and difficult. In this talk, we restrict to the case of Seifert fibered 3-manifolds over an arbitrary oriented base surface F. Such a space M, with non-zero generalised Euler invariant, is determined by (F; e; r_1, ..., r_k) where e > 0 is an integer and r_1,...,r_k > 1 are rationals (here we've oriented M to bound a positive definite plumbing). For e >= k/2, we determine precisely which M pass a powerful obstruction to embedding based on Donaldson's theorem, and then attempt to either embed M or apply further obstructions in those cases. For e > k/2, this gives a complete determination of which such M embed. This is joint work with Duncan McCoy.

**Date/Time: **Friday December 1st, 10am.

**Location:** DSB C122

The mailing list for the topology seminar is: Topology-talks@lists.uvic.ca

Previous Talks 2017-2018 |
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**Cascade Topology Seminar (59 ^{th}). Fall 2017.**

**Date/Time: **Weekend of October 20th, in Victoria BC.

Talks will begin at 10:30am on Saturday (four talks), and the meeting will end at noon on the Sunday (two talks).

**Speakers:**

- Geoffroy Horel (Paris 13)
- Keiichi Sakai (Shinshu U.)
- Gabriel Islambouli (U.Virginia)
- Jeff Meier (U. Georgia)
- Liam Watson (U. Sherbrooke)
- Tomasz Kaczynski (U. Sherbrooke)

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- 2016--2017 Archive.
- 2015--2016 Archive.
- 2014--2015 Archive.
- 2013--2014 Archive.
- 2012--2013 Archive.
- 2008--2012 Archive.

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