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Reference

Reference-equiv

Basic equivalence relation for reference structures.

Definitions and Theorems

Function: reference-equiv$inline

(defun reference-equiv$inline (acl2::x acl2::y)
  (declare (xargs :guard (and (referencep acl2::x)
                              (referencep acl2::y))))
  (equal (reference-fix acl2::x)
         (reference-fix acl2::y)))

Theorem: reference-equiv-is-an-equivalence

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

Theorem: reference-equiv-implies-equal-reference-fix-1

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

Theorem: reference-fix-under-reference-equiv

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

Theorem: equal-of-reference-fix-1-forward-to-reference-equiv

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

Theorem: equal-of-reference-fix-2-forward-to-reference-equiv

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

Theorem: reference-equiv-of-reference-fix-1-forward

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

Theorem: reference-equiv-of-reference-fix-2-forward

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