FUNCTION: BnCode2Interval - list of codes of all group elements below a given one

CALLING SEQUENCE:

BnCode2Interval(code)

BN[BnCode2Interval](code)

PARAMETERS:

code = any list denoting a code

SYNOPSIS:

• The BnCode2Interval function computes the list of all codes of group elements that are smaller than the given code, according to the Bruhat order.

• Whenever there is a conflict between the function name BnCode2Interval and another name used in the same session, use the long form BN['BnCode2Interval'].

EXAMPLES:

> with(BN):
> BnCode2Interval([1, 0, 3]);
 
    [[1, 2, 1], [1, 1, 1], [1, 2, 0], [1, 1, 0], [0, 2, 1], [0, 1, 1],
 
     [0, 2, 0], [0, 1, 0], [1, 0, 1], [0, 0, 1], [1, 0, 0], [0, 0, 0]]