I've been checking several Italian books of logic and math to find some expression equivalent to "range over" as in the following mathematical expression:
Let x, y, and z be variables that range over the natural numbers.
I haven't found an equivalent expression so far, but this is the best I could come up with:
Siano x, y e z variabili che vanno sui numeri naturali.
Siano x, y e z variabili che spaziano tra i numeri naturali.
What would be a better equivalent for this?