On July 19, 2001 I gave an invited talk at CMAF at the University of Lisbon, Portugal.
The title of my talk was Muchnik and Medvedev Degrees of Pi01 Subsets of 2omega. My abstract is available in several formats: DVI, PDF, PS, HTML. My transparencies are available in several formats: PDF, PS.
A list of my recent and upcoming talks is available.
My publication list is available.
I run FOM, an automated e-mail list for discussing foundations of mathematics.
simpson@math.psu.edu / 29 January 2002