PURE AND RANDOM POTTS-LIKE MODELS - REAL-SPACE RENORMALIZATION-GROUP APPROACH

The present status of knowledge on the pure and random Potts models an d various related systems (resistor network, directed bond percolation , Ising-like frustrated models, Z(q) model and the discrete cubic mode l) is reviewed. The available real-space renormalization group techniq ues which can further enlighten this picture are tutorially presented and discussed.