Let Ф be an irreducible root system of classical type. In this short note, we study the irreducible subsystems of Ф and compute the number of irreducible subs
The object of this paper is to investigate the superconvergence properties of finite element approximations to parabolic and hyperbolic integro-differential equ
The word theorem states that x can be denoted as a rotation inserting word of A if x is in the normal closure of A in F(X).As an application of the theorem,in t