FUNCTION: Iss - test whether the argument is an element of the Schur basis

CALLING SEQUENCE:

Iss(expr)

TYP[Iss](expr)

PARAMETERS:

expr = any expression

SYNOPSIS:

• The Iss function tests whether the argument expr is an element of the Schur basis, that is s[part] where part denotes a partition in non-increasing order.

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

EXAMPLES:

> with(TYP):
> Iss(s[2,1,1]);
 
                                     true