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Struct-denv

Struct-denv-fix

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

Signature
(struct-denv-fix x) → *
Arguments: x — Guard (struct-denvp x).

Definitions and Theorems

Function: struct-denv-fix

(defun struct-denv-fix (x)
  (declare (xargs :guard (struct-denvp x)))
  (mbe :logic (if (struct-denvp x) x nil)
       :exec x))

Theorem: struct-denvp-of-struct-denv-fix

(defthm struct-denvp-of-struct-denv-fix
  (struct-denvp (struct-denv-fix x)))

Theorem: struct-denv-fix-when-struct-denvp

(defthm struct-denv-fix-when-struct-denvp
  (implies (struct-denvp x)
           (equal (struct-denv-fix x) x)))

Theorem: emptyp-struct-denv-fix

(defthm emptyp-struct-denv-fix
  (implies (or (omap::emptyp x)
               (not (struct-denvp x)))
           (omap::emptyp (struct-denv-fix x))))

Theorem: emptyp-of-struct-denv-fix-to-not-struct-denv-or-emptyp

(defthm emptyp-of-struct-denv-fix-to-not-struct-denv-or-emptyp
  (equal (omap::emptyp (struct-denv-fix x))
         (or (not (struct-denvp x))
             (omap::emptyp x))))

Function: struct-denv-equiv$inline

(defun struct-denv-equiv$inline (acl2::x acl2::y)
  (declare (xargs :guard (and (struct-denvp acl2::x)
                              (struct-denvp acl2::y))))
  (equal (struct-denv-fix acl2::x)
         (struct-denv-fix acl2::y)))

Theorem: struct-denv-equiv-is-an-equivalence

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

Theorem: struct-denv-equiv-implies-equal-struct-denv-fix-1

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

Theorem: struct-denv-fix-under-struct-denv-equiv

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

Theorem: equal-of-struct-denv-fix-1-forward-to-struct-denv-equiv

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

Theorem: equal-of-struct-denv-fix-2-forward-to-struct-denv-equiv

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

Theorem: struct-denv-equiv-of-struct-denv-fix-1-forward

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

Theorem: struct-denv-equiv-of-struct-denv-fix-2-forward

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