coerce to a natural number
Major Section:  ACL2-BUILT-INS

Nfix simply returns any natural number argument unchanged, returning 0 on an argument that is not a natural number. Also see ifix, see rfix, see realfix, and see fix for analogous functions that coerce to an integer, a rational number, a real, and a number, respectively.

Nfix has a guard of t.

To see the ACL2 definition of this function, see pf.