Let Φ be an irreducible root system of classical type. In t his short note, we study the irreducible subsystems of Φ and compute the nu mber of irreducible subsystems of any rank k in Φ.
文摘Let Φ be an irreducible root system of classical type. In t his short note, we study the irreducible subsystems of Φ and compute the nu mber of irreducible subsystems of any rank k in Φ.
