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• Data-item

Data-item-equiv

Basic equivalence relation for data-item structures.

Definitions and Theorems

Function: data-item-equiv$inline

(defun data-item-equiv$inline (acl2::x acl2::y)
  (declare (xargs :guard (and (data-item-p acl2::x)
                              (data-item-p acl2::y))))
  (equal (data-item-fix acl2::x)
         (data-item-fix acl2::y)))

Theorem: data-item-equiv-is-an-equivalence

(defthm data-item-equiv-is-an-equivalence
  (and (booleanp (data-item-equiv x y))
       (data-item-equiv x x)
       (implies (data-item-equiv x y)
                (data-item-equiv y x))
       (implies (and (data-item-equiv x y)
                     (data-item-equiv y z))
                (data-item-equiv x z)))
  :rule-classes (:equivalence))

Theorem: data-item-equiv-implies-equal-data-item-fix-1

(defthm data-item-equiv-implies-equal-data-item-fix-1
  (implies (data-item-equiv acl2::x x-equiv)
           (equal (data-item-fix acl2::x)
                  (data-item-fix x-equiv)))
  :rule-classes (:congruence))

Theorem: data-item-fix-under-data-item-equiv

(defthm data-item-fix-under-data-item-equiv
  (data-item-equiv (data-item-fix acl2::x)
                   acl2::x)
  :rule-classes (:rewrite :rewrite-quoted-constant))

Theorem: equal-of-data-item-fix-1-forward-to-data-item-equiv

(defthm equal-of-data-item-fix-1-forward-to-data-item-equiv
  (implies (equal (data-item-fix acl2::x) acl2::y)
           (data-item-equiv acl2::x acl2::y))
  :rule-classes :forward-chaining)

Theorem: equal-of-data-item-fix-2-forward-to-data-item-equiv

(defthm equal-of-data-item-fix-2-forward-to-data-item-equiv
  (implies (equal acl2::x (data-item-fix acl2::y))
           (data-item-equiv acl2::x acl2::y))
  :rule-classes :forward-chaining)

Theorem: data-item-equiv-of-data-item-fix-1-forward

(defthm data-item-equiv-of-data-item-fix-1-forward
  (implies (data-item-equiv (data-item-fix acl2::x)
                            acl2::y)
           (data-item-equiv acl2::x acl2::y))
  :rule-classes :forward-chaining)

Theorem: data-item-equiv-of-data-item-fix-2-forward

(defthm data-item-equiv-of-data-item-fix-2-forward
  (implies (data-item-equiv acl2::x (data-item-fix acl2::y))
           (data-item-equiv acl2::x acl2::y))
  :rule-classes :forward-chaining)