UNARY-_slash_.html -- ACL2 Version 6.3

### UNARY-/

reciprocal function

    Major Section:  ACL2-BUILT-INS

Completion Axiom (`completion-of-unary-/`):

    (equal (unary-/ x)
           (if (and (acl2-numberp x)
                    (not (equal x 0)))
               (unary-/ x)
             0))

Guard for `(unary-/ x)`:

    (and (acl2-numberp x)
         (not (equal x 0)))

Notice that like all arithmetic functions, `unary-/` treats non-numeric inputs as `0`.

Calls of the macro `/` on one argument expand to calls of `unary-/`; see /.