Characterization of Dynkin diagrams
Nowadays, I am reading D.J.Benson's nice book, volume I of Representations and cohomology . I found it has a nice description on Dynkin diagrams. So I want to make a note on it and on it here. If the application is successful, I will have more time on Mathematiques intersting me. If the time permits, I will make anther note about the relationship of root system and Dynkin diagrams. Contents Dynkin diagrams and Euclidean diagrams Cartan matrix and characterization of Dynkin diagrams using subadditve functions Characterization using positive definity of Cartan's matrix Dynkin diagrams and