Fixing function for type-product structures.
(type-product-fix x) → new-x
Function:
(defun type-product-fix$inline (x) (declare (xargs :guard (type-productp x))) (let ((__function__ 'type-product-fix)) (declare (ignorable __function__)) (mbe :logic (b* ((fields (field-list-fix (cdr (std::da-nth 0 x)))) (invariant (maybe-expression-fix (cdr (std::da-nth 1 x))))) (list (cons 'fields fields) (cons 'invariant invariant))) :exec x)))
Theorem:
(defthm type-productp-of-type-product-fix (b* ((new-x (type-product-fix$inline x))) (type-productp new-x)) :rule-classes :rewrite)
Theorem:
(defthm type-product-fix-when-type-productp (implies (type-productp x) (equal (type-product-fix x) x)))
Function:
(defun type-product-equiv$inline (acl2::x acl2::y) (declare (xargs :guard (and (type-productp acl2::x) (type-productp acl2::y)))) (equal (type-product-fix acl2::x) (type-product-fix acl2::y)))
Theorem:
(defthm type-product-equiv-is-an-equivalence (and (booleanp (type-product-equiv x y)) (type-product-equiv x x) (implies (type-product-equiv x y) (type-product-equiv y x)) (implies (and (type-product-equiv x y) (type-product-equiv y z)) (type-product-equiv x z))) :rule-classes (:equivalence))
Theorem:
(defthm type-product-equiv-implies-equal-type-product-fix-1 (implies (type-product-equiv acl2::x x-equiv) (equal (type-product-fix acl2::x) (type-product-fix x-equiv))) :rule-classes (:congruence))
Theorem:
(defthm type-product-fix-under-type-product-equiv (type-product-equiv (type-product-fix acl2::x) acl2::x) :rule-classes (:rewrite :rewrite-quoted-constant))
Theorem:
(defthm equal-of-type-product-fix-1-forward-to-type-product-equiv (implies (equal (type-product-fix acl2::x) acl2::y) (type-product-equiv acl2::x acl2::y)) :rule-classes :forward-chaining)
Theorem:
(defthm equal-of-type-product-fix-2-forward-to-type-product-equiv (implies (equal acl2::x (type-product-fix acl2::y)) (type-product-equiv acl2::x acl2::y)) :rule-classes :forward-chaining)
Theorem:
(defthm type-product-equiv-of-type-product-fix-1-forward (implies (type-product-equiv (type-product-fix acl2::x) acl2::y) (type-product-equiv acl2::x acl2::y)) :rule-classes :forward-chaining)
Theorem:
(defthm type-product-equiv-of-type-product-fix-2-forward (implies (type-product-equiv acl2::x (type-product-fix acl2::y)) (type-product-equiv acl2::x acl2::y)) :rule-classes :forward-chaining)