  Contents:
  1 Frustrated quantum spin systems
  1.1 The Pyrochlore checkerboard
  1.2 Singlets in reflection symmetric spin systems
  2 Wehrl entropy of Bloch coherent states
  2.1 Conjectures of Wehrl and Lieb
  2.2 Proof of Lieb's conjecture for low spin
  3 Symmetries of the Hubbard model
  4 Quantum integrable systems
  4.1 Twisted quantum Lax equations
  4.2 Face algebras and Ruijsenaars models
  5 Noncommutative gauge theory
  5.1 Gauge theory on noncommutative spaces
  5.2 Seiberg-Witten map and Kontsevich formality, Born-Infeld action in the
intermediate picture
  5.3 Nonabelian noncommutative gauge fields
