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SUMMARY:Knot concordance in homology spheres - Jen Hom (Georgia Institute 
 of Technology)
DTSTART:20170203T113000Z
DTEND:20170203T123000Z
UID:TALK70597@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:The knot concordance group C consists of knots in S^3 modulo k
 nots that bound smooth disks in B^4. We consider C_Z\, the group of knots 
 in homology spheres that bound homology balls modulo knots that bound smoo
 th disks in a homology ball. Matsumoto asked if the natural map from C to 
 C_Z&nbsp\;is an isomorphism. Adam Levine answered this question in the neg
 ative by showing the map is not surjective. We show that the image of C in
  C_Z&nbsp\;is of infinite index. This is joint work with Adam Levine and T
 ye Lidman.
LOCATION:Seminar Room 1\, Newton Institute
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