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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)))