### MINUSP

test whether a number is negative
Major Section: ACL2-BUILT-INS

`(Minusp x)`

is true if and only if `x < 0`

.

The guard of `minusp`

requires its argument to be a rational (real, in
ACL2(r)) number.

`Minusp`

is a Common Lisp function. See any Common Lisp
documentation for more information.

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