FUNCTION: IsSkewPart - test whether the argument is a skew partition

CALLING SEQUENCE:

IsSkewPart(expr)

TYP[IsSkewPart](expr)

PARAMETERS:

expr = any expression

SYNOPSIS:

• The IsSkewPart function tests whether expr is a skew partition, that is, a list with two components l1 and l2, l1 being the exterior shape, l2 the interior shape. A skew partition is more general than a skew diagram, the only condition is that the diagram of l1 contains the one of l2.

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

EXAMPLES:

> with(TYP):
> IsSkewPart([[3,1,1], [2,1]]);
 
                                     true
 
> IsSkewPart([[4,2], [3,3]]);
 
                                    false