books.google.com - §22. K-theory 230 A. Topological X-theory 230 Vector bundles and the functor Vec(X). Periodicity and the functors KJX). K(X) and t the infinite-dimensional linear group. The symbol of an elliptic differential operator. The index theorem. B. Algebraic K-theory 234 The group of classes of projective modules....http://books.google.com/books/about/Basic_Notions_of_Algebra.html?id=CHadhWO4DWYC&utm_source=gb-gplus-shareBasic Notions of Algebra