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Dexpo

Dexpop

Recognizer for dexpo structures.

Signature
(dexpop x) → *

Definitions and Theorems

Function: dexpop

(defun dexpop (x)
  (declare (xargs :guard t))
  (and (consp x)
       (consp (cdr x))
       (b* ((prefix (car x))
            (sign? (car (cdr x)))
            (digits (cdr (cdr x))))
         (and (dexprefixp prefix)
              (sign-optionp sign?)
              (dec-digit-char-listp digits)))))

Theorem: consp-when-dexpop

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