Schedule of Talks

Howdy, gfesters! Here's a list of everyone who told me they want to come
to the fest:

Valentin Deaconu
Doug Drinen
Igor Fulman
Lu Jiang-Hua
Minhyong Kim
Alex Kumjian
Paul Muhly
David Pask
Alan Paterson
Jacqui Ramagge
Nandor Sieben
Alan Weinstein
Dana Williams

Seems small. Cozy. The way I like it. Anyway, I've gathered all the
responses regarding talks, and slapped together a tentative schedule:

...and everything I know about titles and abstracts:

Deaconu: Cohomology of topological graphs and pimsner algebra

 abstract: We use the long exact sequence of Kumjian to compute the
sheaf cohomology of the groupoid \Gamma associated to a topological
graph.  We show that certain twisted groupoid C*-algebras associated to
\Gamma are isomorphic to Pimsner algebras.

Drinen: Isomorphism of graph groupoids 

 abstract: For a row-finite directed graph E, Kumjian, Pask, and 
Raeburn defined its graph C*-algebra C*(E).  If E has no sinks, then 
C*(E) \cong C*({G}_E), where {G}_E is the graph groupoid, a 
construction of Kumjian, Pask, Raeburn, and Renault.  We investigate 
some graph transformations which preserve the graph groupoid.

Fulman: Ideals in the algebra of a one-sided dynamical system

 abstract: We use a spectral theorem for bimodules (an analog of the
theorem by Muhly and Solel) to describe ideals in the non-selfadjoint
algebra arising from a one-sided dynamical system. Unlike in the case
considered by Muhly and Solel, in our case the groupoid arising is
not r-discrete.

Kumjian: C*-algebras of multigraphs

 abstract: Building on recent work of G. Robertson & T. Steger, we
consider certain C*-algebras associated to multigraphs.  Under mild
assumptions the C*-algebra of a multigraph may be seen to be isomorphic
to the C*-algebra of a groupoid associated to the multigraph.

Lu: Hopf algebras coming from groupoids

Pask: Semigroup actions on graph algebras

Paterson: Asymptotic morphisms and the analytic index map for Lie
groupoids

 abstract: We will discuss the construction of a canonical asymptotic
morphism {T_{\epsilon}} in E(C_{0}(A(G)^{*}), C^{*}(G)) associated
with a Lie groupoid G. When G is a trivial groupoid, this asymptotic
morphism is the Connes-Higson asymptotic morphism.  For general G,
the asymptotic morphism induces the analytic index map on the groupoid.

Ramsay: Local action groupoids

 abstract: The title refers to groupoids with the property that every
point in the space of units has a neighborhood to which the restriction of
the groupoid is isomorphic to a groupoid arising from an action of a group
on that neighborhood.  Most of the talk will be about results on the case
in which the group is always the circle.  These results were obtained
by El Sayed Sallam in his Ph.D. work, extending some results of Baum,
Brylinski and MacPherson on delocalized cohomology to such groupoids.

Sieben: Fell bundles over inverse semigroups and r-discrete groupoids

 abstract: Fell bundles over inverse semigroups are introduced and shown 
to be closely related to Fell bundles over r-discrete groupoids. Twisted 
semidirect product bundles are characterized as homogeneous Fell bundles. 

Weinstein: Toward normal forms for proper groupoids and Lie algebroids

-------------------------

All the talks will be in PSA 203, and you can use a chalk board (sorry, no
big chalk, but we do have big erasers!) and/or a transparency projector.

If you want to talk but haven't told me yet, tell me (Quigg) now.

If you want to talk but haven't given me a title and abstract yet, give
them to me as soon as you can.

If you want to come but haven't told me yet, tell me now, so I can get
an idea of how many we'll be. I need to know this not only for coffee &
donuts, but also for Saturday night. There's nothing formal planned for
Saturday night, but we've reserved space at a local brew-pub so we can
gather. You'll be able to order your own food and drinks --- it's
minimally organized, in keeping with my understanding of the spirit of
the conference.