FUNCTION: BnaCode2Bar - convert codes into signed permutations

CALLING SEQUENCE:

BnaCode2Bar(e)

BNA[BnaCode2Bar](e)

PARAMETERS:

e = any element of any Bn-algebra

SYNOPSIS:

• The BnaCode2Bar function converts all codes that appear in the element e into signed permutations. The element e can belong to any Bn-algebra, but the result is no longer considered as an element of a Bn-algebra, the bases in this package being indexed by codes.

• Whenever there is a conflict between the function name BnaCode2Bar and another name used in the same session, use the long form BNA['BnaCode2Bar'].

EXAMPLES:

> with(BNA):
> BnaCode2Bar(q*B[0,1,0,2] - q^2*B[1,1,0,3]);
 
                                        2
                     q B[2, 4, 1, 3] - q  B[4, 2, -1, 3]