FUNCTION: IsCompo - test whether the argument is a composition

CALLING SEQUENCE:

IsCompo(expr)

TYP[IsCompo](expr)

PARAMETERS:

expr = any expression

SYNOPSIS:

• The IsCompo function tests whether expr is a composition that is a list of positive integers.

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

EXAMPLES:

> with(TYP):
> IsCompo([1,2,1,3,2]);
 
                                     true