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Geometric Group Theory Seminar - Jack Calcut

December 9, 2014
1:45 pm - 2:45 pm
Cockins Hall 240

Title: Connected sum at infinity

Speaker: Jack Calcut (Oberlin College)

Seminar URL: https://research.math.osu.edu/ggt/

Abstract: The Connected Sum at Infinity operation (CSI), also called end sum, was introduced by Gompf to study exotic R^4's. It has been used by Ancel to study Davis manifolds and by Tinsley and Wright and by Myers to study 3-manifolds. After recalling the definition and basic properties of CSI, we will present a few of its applications and discuss its dependence on choices in dimension 4. The latter is joint work with Patrick Haggerty and answers affirmatively a conjecture of Siebenmann. Some open questions will be included.

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Seminar - Geometric Group Theory