POSP.html -- ACL2 Version 6.3

### POSP

a recognizer for the positive integers

    Major Section:  ACL2-BUILT-INS

`(posp x)` is logically equivalent to `(not (zp x))` (see zp) and also to `(and (natp x) (not (equal x 0)))`. We recommend the community book `books/ordinals/natp-posp` for reasoning about `posp` and `natp`. This book is included by community books `books/arithmetic/top` and `books/arithmetic/top-with-meta`.

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