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• Assignment

Assignment-fix

(assignment-fix x) is a usual ACL2::fty omap fixing function.

Signature

(assignment-fix x) → *

Arguments

x — Guard (assignmentp x).

Definitions and Theorems

Function: assignment-fix

(defun assignment-fix (x)
  (declare (xargs :guard (assignmentp x)))
  (mbe :logic (if (assignmentp x) x nil)
       :exec x))

Theorem: assignmentp-of-assignment-fix

(defthm assignmentp-of-assignment-fix
  (assignmentp (assignment-fix x)))

Theorem: assignment-fix-when-assignmentp

(defthm assignment-fix-when-assignmentp
  (implies (assignmentp x)
           (equal (assignment-fix x) x)))

Theorem: emptyp-assignment-fix

(defthm emptyp-assignment-fix
  (implies (or (omap::emptyp x)
               (not (assignmentp x)))
           (omap::emptyp (assignment-fix x))))

Theorem: emptyp-of-assignment-fix-to-not-assignment-or-emptyp

(defthm emptyp-of-assignment-fix-to-not-assignment-or-emptyp
  (equal (omap::emptyp (assignment-fix x))
         (or (not (assignmentp x))
             (omap::emptyp x))))

Function: assignment-equiv$inline

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

Theorem: assignment-equiv-is-an-equivalence

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

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

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

Theorem: assignment-fix-under-assignment-equiv

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

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

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

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

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

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

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

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

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