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SUMMARY:Raphael Zentner (Durham University)
DTSTART:20231005T130500Z
DTEND:20231005T140000Z
DTSTAMP:20260423T003232Z
UID:GaTO/83
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/GaTO/83/">Ra
 tional homology ribbon cobordism is a partial order</a>\nby Raphael Zentne
 r (Durham University) as part of Geometry and topology online\n\nLecture h
 eld in Room B3.02 in the Zeeman Building\, University of Warwick.\n\nAbstr
 act\nLast year\, Ian Agol proved that ribbon knot concordance is a partial
  order on knots\; this resolves a conjecture that has been open for more t
 han three decades. His proof is beautiful and surprisingly simple. There i
 s an analogous notion of ribbon cobordism for closed 3-manifolds. We use A
 gol's method to show that this is also a partial order within the class of
  irreducible 3-manifolds. \n\nThis is joint work with Stefan Friedl and Fi
 lip Misev.\n
LOCATION:https://researchseminars.org/talk/GaTO/83/
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