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Dec-frac-const

Dec-frac-constp

Recognizer for dec-frac-const structures.

Signature
(dec-frac-constp x) → *

Definitions and Theorems

Function: dec-frac-constp

(defun dec-frac-constp (x)
  (declare (xargs :guard t))
  (and (consp x)
       (b* ((before (car x)) (after (cdr x)))
         (and (dec-digit-char-listp before)
              (dec-digit-char-listp after)))))

Theorem: consp-when-dec-frac-constp

(defthm consp-when-dec-frac-constp
  (implies (dec-frac-constp x) (consp x))
  :rule-classes :compound-recognizer)