product ? *** and sum ? ***

[Thomas Ritschel]

According to the manual the arguments (a, b, and p) should be integers:

Code:

product(Expr||Lst,[Var||Lst],[Intg(a)],[Intg(b)],[Intg(p)])

It turns out that the step size (p) could be non-integral, but a and b must be integers. Otherwise you'll get those "list products" (e.g. multiplication of all 5 arguments).