Seminar Calendar
for events the day of Monday, March 1, 2010.

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Monday, March 1, 2010

Differential Geometry Seminar
2:00 pm   in 441 Altgeld Hall,  Monday, March 1, 2010
 Del Edit Copy
Submitted by ekerman.
 Al Momin (Purdue University)Contact homology on the complement of Reeb orbitsAbstract: I will describe one way how to make sense of (cylindrical) contact homology (in 3-dimensional contact manifolds) on the complement of a collection of Reeb orbits. One application is that when the result is non-trivial, one can prove that the existence of certain closed orbits will force the existence of other closed orbits for Reeb vector fields. The key point in this work is the positivity of intersections of holomorphic curves in the (non-compact) 4-dimensional symplectization.

MATRIX talk
5:00 pm   in 245 Altgeld Hall,  Monday, March 1, 2010
 Del Edit Copy
Submitted by ahlgren.
 Scott Ahlgren (UIUC)A=BAbstract: How can you systematically prove that A=B? I'll describe the ground-breaking W-Z method'' of automatic identity proving. This takes all of the guesswork out of proving such things, and makes the proof so simple that a caveman could do it. I'll also describe how you might someday write a joint paper with a computer (like I did). This will be an understandable talk, and should be useful for everyone.