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 Tour dates

  • March 6th, 2008
  • 10:57 pm

Edited to add Galway

I’ll be doing a “US tour” in March / April. For the people who might be interested – here are my whereabouts, and my speaking engagements.

I’m booked at several different seminars to do the following:

Title: On the computation of A-infinity algebras and Ext-algebras

For a ring R, the Ext algebra Ext_R^*(k,k) carries rich information about the ring and its module category. The algebra Ext_R^*(k,k) is a finitely presented k-algebra for most nice enough rings. Computation of this ring is done by constructing a projective resolution P of k and either constructing the complex Hom(P_n,k) or equivalently constructing the complex Hom(P,P). By diligent choice of computational route, the computation can be framed as essentially computing the homology of the differential graded algebra Hom(P,P).

Being the homology of a dg-algebra, Ext_R^*(k,k) has an induced A-infinity structure. This structure, has been shown by Keller and by Lu-Palmieri-Wu-Zhang, can be used to reconstruct R from
Ext_R^{\leq 2}(k,k).

In this talk, we shall discuss the computation of Ext_R^*(k,k) and methods for computing an A-infinity structure on the Ext algebra. Examples will be drawn from group cohomology, where the computation of the Ext algebra has conditions from Benson and Carlson for recognizing whether a partial computation has the entire structure.

Talk dates are:
19 – Stockholm University
26 – UPenn
27 – Millersville
29/30 – Graduate Student Topology Conference, UIUC
8 – Stanford
11 – U Washington, Seattle
8 – NUI Galway

I will be in Millersville, with occasional visits to UPenn during March 25-28 and April 10-20. I’ll be somewhere in Illinois most of March 28, and at UIUC for the GSTC 29-30. I’ll be at MSRI March 31-April 4, and then at Stanford April 4-10.

5 People had this to say...


Cool. I’ll see you when you get to Penn. You’re going to be in the Deformation Theory Seminar, I assume?

  • Michi
  • March 7th, 2008
  • 9:10

Charles: Yup, that’s the one. I think, at least. Stasheff coordinates it?

  • John Palmieri
  • March 7th, 2008
  • 20:03

Any chance you can squeeze a trip to Seattle in there somewhere?


Yep, that’s it.

  • sigfpe
  • April 8th, 2008
  • 18:41

You in town today? (San Francisco) Reply to my email address.

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