FUNCTION: BnaAdd - sum of two elements of any Bn-algebra

CALLING SEQUENCE:

BnaAdd(e_1, e_2)

BNA[BnaAdd](e_1, e_2)

PARAMETERS:

e_1, e_2 = any elements of any Bn-algebra

SYNOPSIS:

• The BnaAdd function adds two elements of either the Bn-group algebra, Bn-nilCoxeter algebra or the Bn-idCoxeter algebra.

• One can use instead the operator &!!+.

• Whenever there is a conflict between the function name BnaAdd and another name used in the same session, use the long form BNA['BnaAdd'].

EXAMPLES:

> with(BNA):
> a:=q + u/t*B[0,1,2]:
> b:=t - B[1,2,1]:
> BnaAdd(a, b);
 
                              u B[0, 1, 2]
               - B[1, 2, 1] + ------------ + (q + t) B[0, 0, 0]
                                    t
 
> a &!!+ b;
 
                              u B[0, 1, 2]
               - B[1, 2, 1] + ------------ + (q + t) B[0, 0, 0]
                                    t