Automorphisms and Derivations

  • Pere Ara
  • Martin Mathieu
Part of the Springer Monographs in Mathematics book series (SMM)


With this chapter, we start the application of local multipliers to the study of operators on C*-algebras. Among the most important classes of linear mappings on C*-algebras are automorphisms and derivations. In physical terms, that is, if the self-adjoint part of a C*-algebra serves as the set of observables of a quantum system, automorphisms correspond to the symmetries, while one-parameter automorphism groups describe the reversible time evolution of the system (in the Heisenberg picture). Their infinitesimal generators are the derivations, which also play an important role in the structure theory of C*-algebras, notably in cohomology theory.


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Copyright information

© Springer-Verlag London 2003

Authors and Affiliations

  • Pere Ara
    • 1
  • Martin Mathieu
    • 2
  1. 1.Departament de MatemàtiquesUniversitat Autónorna de BarcelonaBellaterraSpain
  2. 2.Department of Pure Mathematics School of Mathematics and PhysicsQueen’s University BelfastBelfastNorthern Ireland

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