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SUMMARY:An invariant for free-by-cyclic groups - Radhika Gupta (Tata Insti
 tute of Fundamental Research)
DTSTART:20250917T100000Z
DTEND:20250917T110000Z
UID:TALK235951@talks.cam.ac.uk
DESCRIPTION:For a free group outer automorphism we define `lamination dept
 h' to be the length of the longest&nbsp\;properly nested sequence of its a
 ttracting laminations. I will talk about joint work with Spencer Dowdall\,
  Yassine Geurch\, Jean Pierre Mutanguha and Caglar Uyanik\, where we show 
 that lamination depth is a group invariant of a free-by-cyclic group. That
  is\, a free-by-cyclic group can be viewed as the mapping torus of a free 
 group outer automorphism in multiple ways and we show that each such outer
  automorphism has the same lamination depth. &nbsp\;
LOCATION:Seminar Room 2\, Newton Institute
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