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Symbol-value

Symbol-value-equiv

Basic equivalence relation for symbol-value structures.

Definitions and Theorems

Function: symbol-value-equiv$inline

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

Theorem: symbol-value-equiv-is-an-equivalence

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

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

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

Theorem: symbol-value-fix-under-symbol-value-equiv

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

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

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

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

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

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

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

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

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