		Search-engine friendly clone of the ACL2 documentation.

A4vec

A4vec-p

Recognizer for a4vec structures.

Signature
(a4vec-p x) → *

Definitions and Theorems

Function: a4vec-p

(defun a4vec-p (x)
  (declare (xargs :guard t))
  (let ((__function__ 'a4vec-p))
    (declare (ignorable __function__))
    (and (consp x)
         (b* ((upper (car x)) (lower (cdr x)))
           (and (true-listp upper)
                (true-listp lower))))))

Theorem: consp-when-a4vec-p

(defthm consp-when-a4vec-p
  (implies (a4vec-p x) (consp x))
  :rule-classes :compound-recognizer)