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• Oct-digit-char-list

Oct-digit-char-list-equiv

Basic equivalence relation for oct-digit-char-list structures.

Definitions and Theorems

Function: oct-digit-char-list-equiv$inline

(defun oct-digit-char-list-equiv$inline (x y)
  (declare (xargs :guard (and (oct-digit-char-listp x)
                              (oct-digit-char-listp y))))
  (equal (oct-digit-char-list-fix x)
         (oct-digit-char-list-fix y)))

Theorem: oct-digit-char-list-equiv-is-an-equivalence

(defthm oct-digit-char-list-equiv-is-an-equivalence
  (and (booleanp (oct-digit-char-list-equiv x y))
       (oct-digit-char-list-equiv x x)
       (implies (oct-digit-char-list-equiv x y)
                (oct-digit-char-list-equiv y x))
       (implies (and (oct-digit-char-list-equiv x y)
                     (oct-digit-char-list-equiv y z))
                (oct-digit-char-list-equiv x z)))
  :rule-classes (:equivalence))

Theorem: oct-digit-char-list-equiv-implies-equal-oct-digit-char-list-fix-1

(defthm
  oct-digit-char-list-equiv-implies-equal-oct-digit-char-list-fix-1
  (implies (oct-digit-char-list-equiv x x-equiv)
           (equal (oct-digit-char-list-fix x)
                  (oct-digit-char-list-fix x-equiv)))
  :rule-classes (:congruence))

Theorem: oct-digit-char-list-fix-under-oct-digit-char-list-equiv

(defthm oct-digit-char-list-fix-under-oct-digit-char-list-equiv
  (oct-digit-char-list-equiv (oct-digit-char-list-fix x)
                             x)
  :rule-classes (:rewrite :rewrite-quoted-constant))

Theorem: equal-of-oct-digit-char-list-fix-1-forward-to-oct-digit-char-list-equiv

(defthm
 equal-of-oct-digit-char-list-fix-1-forward-to-oct-digit-char-list-equiv
 (implies (equal (oct-digit-char-list-fix x) y)
          (oct-digit-char-list-equiv x y))
 :rule-classes :forward-chaining)

Theorem: equal-of-oct-digit-char-list-fix-2-forward-to-oct-digit-char-list-equiv

(defthm
 equal-of-oct-digit-char-list-fix-2-forward-to-oct-digit-char-list-equiv
 (implies (equal x (oct-digit-char-list-fix y))
          (oct-digit-char-list-equiv x y))
 :rule-classes :forward-chaining)

Theorem: oct-digit-char-list-equiv-of-oct-digit-char-list-fix-1-forward

(defthm
     oct-digit-char-list-equiv-of-oct-digit-char-list-fix-1-forward
  (implies (oct-digit-char-list-equiv (oct-digit-char-list-fix x)
                                      y)
           (oct-digit-char-list-equiv x y))
  :rule-classes :forward-chaining)

Theorem: oct-digit-char-list-equiv-of-oct-digit-char-list-fix-2-forward

(defthm
     oct-digit-char-list-equiv-of-oct-digit-char-list-fix-2-forward
  (implies (oct-digit-char-list-equiv x (oct-digit-char-list-fix y))
           (oct-digit-char-list-equiv x y))
  :rule-classes :forward-chaining)