K Theory and Operator Algebras : Proceedings of a Conference held at the University of Georgia in Athens Georgia April 21–25 1975 A survey of K theory Characterizing Ext(X) Almost commuting algebras Extensions of C* algebras and K homology Bundles and sheaves are equivalent in the category of banach spaces Topological obstructions to perturbations of pairs of operators On algebraic K theory and the homology of congruence subgroups Configuration spaces Extensions of C* algebras and the reducing essential matricial spectra of an operator K homology theory and algebraic K theory Some remarks on operator theory and index theory Factors of type III Twisted products of Banach algebras and third ech cohomology H cobordisms pseudo isotopies and analytic torsion.