The Informal Symplectic Geometry Seminar meets 9:30-10:30am in Math 520 on Fridays. The Informal Symplectic Geometry Seminar should not be confused with Columbia's more traditional Symplectic Geometry and Gauge Theory seminar.
Previous semesters: Spring 2009, Fall 2008, Spring 2008, Fall 2007.
| Date | Speaker | Title |
|---|---|---|
Sept. 18 |
Peter Horn (Columbia) | Knot concordance and gropes |
Sept. 25 |
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Oct. 2 |
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Oct. 9 |
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Oct. 16 |
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Oct. 23 |
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Oct. 30 |
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Nov. 6 |
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Nov. 13 |
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Nov. 20 |
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Nov. 27 |
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Dec. 4 |
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Dec. 11 |
Abstracts.
September 18, 2009.
Peter Horn (Columbia), "Knot concordance and gropes"
Abstract: In the late 90s, Cochran, Orr and Teichner introduced two filtrations of the knot concordance group. I will discuss the grope filtration of the knot concordance group and some invariants that are generalizations of the slice genus of a knot. I will discuss some of the constructions and obstructions in this corner of knot theory.
Other relevant information.
Our e-mail list.
Announcements for this seminar, as well as for related seminars and events, are sent to the "Floer Homology" e-mail list maintained via Google Groups. You can subscribe directly via Google Groups or by contacting R. Lipshitz.