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4vec

4vec-p

Recognizer for 4vecs.

Signature
(4vec-p x) → *

Definitions and Theorems

Function: 4vec-p

(defun 4vec-p (x)
  (declare (xargs :guard t))
  (let ((__function__ '4vec-p))
    (declare (ignorable __function__))
    (or (integerp x)
        (and (consp x)
             (integerp (car x))
             (integerp (cdr x))
             (not (equal (car x) (cdr x)))))))

Theorem: 4vec-p-when-integerp

(defthm 4vec-p-when-integerp
  (implies (integerp x) (4vec-p x)))