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DTSTART:20070311T020000
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BEGIN:VEVENT
DTSTAMP:20261025T165532
DTSTART;TZID=America/Detroit:20261026T160000
DTEND;TZID=America/Detroit:20261026T170000
SUMMARY:Lecture / Discussion:Dynamics Seminar: Automorphisms of the Grand Arc Graph
DESCRIPTION:Mapping class groups of finite-type surfaces have often been studied via their action on various graphs\, whose vertices correspond to homotopy classes of certain arcs or curves on the surface\, with edges between homotopically disjoint arcs or curves. In 2006\, Ivanov posed a ​\"metaconjecture\": every object naturally associated to a surface\, which admits an action of the mapping class group\, with sufficiently rich structure has its group of automorphisms be the mapping class group. This is true for a lot of these arc/curve graphs — in particular\, this means that the combinatorial structure of these graphs perfectly captures the topology of the surface. \n\nIn this talk\, we shall explore Ivanov’s metaconjecture for mapping class groups of infinite-type surfaces. We shall focus on the action on “the grand arc graph”\, first introduced by Bar-Natan—Verberne\, which is an infinite-diameter\, hyperbolic graph defined on a large class of infinite-type surfaces. This talk contains joint work with G. Shaji.
UID:152182-21913184@events.umich.edu
URL:https://events.umich.edu/event/152182
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Dynamics
LOCATION:East Hall - 3096
CONTACT:
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BEGIN:VEVENT
DTSTAMP:20261026T105540
DTSTART;TZID=America/Detroit:20261102T160000
DTEND;TZID=America/Detroit:20261102T170000
SUMMARY:Lecture / Discussion:Dynamics Seminar: Yet another unstabilizable rational surface map
DESCRIPTION:I will discuss a newly identified example of a plane rational map that has constant Jacobian determinant relative to the natural holomorphic volume form on the algebraic torus.  A distinguishing feature is that it `tropicalizes' as a self-map of the circle that is topologically conjugate to angle doubling.  Using this and post-composing with an appropriate monomial map we get a new and rather different example of a rational surface map that is not birationally conjugate to any algebraically stable map.  This work\, joint with Chase Bender and Holly Krieger\, relies on some AI input\, but maybe not where you'd guess it does.
UID:152181-21913183@events.umich.edu
URL:https://events.umich.edu/event/152181
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Dynamics
LOCATION:East Hall - 3096
CONTACT:
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BEGIN:VEVENT
DTSTAMP:20260928T173211
DTSTART;TZID=America/Detroit:20261109T160000
DTEND;TZID=America/Detroit:20261109T170000
SUMMARY:Lecture / Discussion:Dynamics seminar
DESCRIPTION:TBA
UID:153015-21914925@events.umich.edu
URL:https://events.umich.edu/event/153015
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Dynamics
LOCATION:East Hall - 3096
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20260928T173242
DTSTART;TZID=America/Detroit:20261116T160000
DTEND;TZID=America/Detroit:20261116T170000
SUMMARY:Lecture / Discussion:Dynamics seminar
DESCRIPTION:TBA
UID:152951-21914830@events.umich.edu
URL:https://events.umich.edu/event/152951
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Dynamics
LOCATION:East Hall - 3096
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20261010T063823
DTSTART;TZID=America/Detroit:20261130T160000
DTEND;TZID=America/Detroit:20261130T170000
SUMMARY:Lecture / Discussion:Dynamics seminar: Arithmetic polyhedra
DESCRIPTION:The Koebe-Andreev-Thurston construction associated to every combinatorial 3d polyhedron is a canonical 3d hyperbolic polyhedron\, which happens to be right-angled and ideal.  In particular\, it is the fundamental domain for the Coxeter group generated by the reflections across its facets.  We answer the question: when is this group arithmetic? (Joint work with Pat Devlin\, Anna Felikson\, Alex Kontorovich and Ian Whitehead)
UID:153512-21915944@events.umich.edu
URL:https://events.umich.edu/event/153512
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Dynamics
LOCATION:East Hall - 3096
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20260928T115353
DTSTART;TZID=America/Detroit:20261207T160000
DTEND;TZID=America/Detroit:20261207T170000
SUMMARY:Lecture / Discussion:Dynamics seminar
DESCRIPTION:TBA
UID:152952-21914831@events.umich.edu
URL:https://events.umich.edu/event/152952
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Dynamics
LOCATION:East Hall - 3096
CONTACT:
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