An informal introduction to the ideas and concepts of noncommutative geometry

Details An informal introduction to the ideas and concepts of noncommutative geometry An informal introduction to the ideas and concepts of noncommutative geometry

2006-12-04

arxiv.org/abs/math-ph/0612012v3

Physics

Mathematical Physics

56 pages, Lecture given at the 6th Peyresq meeting "Integrable systems and quantum field theory", misprint corrected in rev. 2

Scientific paper

This informal introduction is an extended version of a three hours lecture given at the 6th Peyresq meeting ``Integrable systems and quantum field theory''. In this lecture, we make an overview of some of the mathematical results which motivated the development of what is called noncommutative geometry. The first of these results is the theorem by Gelfand and Neumark about commutative $C^\ast$-algebras; then come some aspects of the $K$-theories, first for topological spaces, then for $C^\ast$-algebras and finally the purely algebraic version. Cyclic homology is introduced, keeping in mind its relation to differential structures. The last result is the construction of the Chern character, which shows how these developments are related to each other.

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