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• Value

Value-equiv

Basic equivalence relation for value structures.

Definitions and Theorems

Function: value-equiv$inline

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

Theorem: value-equiv-is-an-equivalence

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

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

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

Theorem: value-fix-under-value-equiv

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

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

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

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

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

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

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

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

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