
Dedicated to the memory of Chih-Han Sah, this volume continues a long tradition of one of the most influential mathematical seminars of this century. A number of topics are covered, including combinatorial geometry, connections between logic and geometry, Lie groups, algebras...

Matroid Homology.- Sporadic Homogeneous Structures.- Three Questions about Simplices in Spherical and Hyperbolic 3-Space.- Poisson Structure for Restricted Lie Algebras.- Noncommutative Smooth Spaces.- A Cycle for Integration Yielding the Zonal Spherical Function of Type An.-...