FUNCTION: IsTab - test whether the argument is a tableau

CALLING SEQUENCE:

IsTab(expr)

TYP[IsTab](expr)

PARAMETERS:

expr = any expression

SYNOPSIS:

• The IsTab function tests whether expr is a tableau that is a list of list(s) of integers with some conditions on the list(s) and on these integers.

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

EXAMPLES:

> with(TYP):
> t:=[[5], [3,6], [1,2,7,8]]:
> IsTab(t);
 
                                     true