FUNCTION: Isy - test whether the argument is an y.i indeterminate

CALLING SEQUENCE:

Isy(expr)

TYP[Isy](expr)

PARAMETERS:

expr = any expression

SYNOPSIS:

• The Isy function tests whether expr is an y.i indeterminate where i denotes an integer.

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

EXAMPLES:

> with(TYP):
> Isy(y3);
 
                                true