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• Nat-option-list

Nat-option-list-fix

(nat-option-list-fix x) is a usual fty list fixing function.

Signature

(nat-option-list-fix x) → fty::newx

Arguments

x — Guard (nat-option-listp x).

Returns

fty::newx — Type (nat-option-listp fty::newx).

In the logic, we apply nat-option-fix to each member of the x. In the execution, none of that is actually necessary and this is just an inlined identity function.

Definitions and Theorems

Function: nat-option-list-fix$inline

(defun nat-option-list-fix$inline (x)
  (declare (xargs :guard (nat-option-listp x)))
  (let ((__function__ 'nat-option-list-fix))
    (declare (ignorable __function__))
    (mbe :logic
         (if (atom x)
             nil
           (cons (nat-option-fix (car x))
                 (nat-option-list-fix (cdr x))))
         :exec x)))

Theorem: nat-option-listp-of-nat-option-list-fix

(defthm nat-option-listp-of-nat-option-list-fix
  (b* ((fty::newx (nat-option-list-fix$inline x)))
    (nat-option-listp fty::newx))
  :rule-classes :rewrite)

Theorem: nat-option-list-fix-when-nat-option-listp

(defthm nat-option-list-fix-when-nat-option-listp
  (implies (nat-option-listp x)
           (equal (nat-option-list-fix x) x)))

Function: nat-option-list-equiv$inline

(defun nat-option-list-equiv$inline (x y)
  (declare (xargs :guard (and (nat-option-listp x)
                              (nat-option-listp y))))
  (equal (nat-option-list-fix x)
         (nat-option-list-fix y)))

Theorem: nat-option-list-equiv-is-an-equivalence

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

Theorem: nat-option-list-equiv-implies-equal-nat-option-list-fix-1

(defthm nat-option-list-equiv-implies-equal-nat-option-list-fix-1
  (implies (nat-option-list-equiv x x-equiv)
           (equal (nat-option-list-fix x)
                  (nat-option-list-fix x-equiv)))
  :rule-classes (:congruence))

Theorem: nat-option-list-fix-under-nat-option-list-equiv

(defthm nat-option-list-fix-under-nat-option-list-equiv
  (nat-option-list-equiv (nat-option-list-fix x)
                         x)
  :rule-classes (:rewrite :rewrite-quoted-constant))

Theorem: equal-of-nat-option-list-fix-1-forward-to-nat-option-list-equiv

(defthm
    equal-of-nat-option-list-fix-1-forward-to-nat-option-list-equiv
  (implies (equal (nat-option-list-fix x) y)
           (nat-option-list-equiv x y))
  :rule-classes :forward-chaining)

Theorem: equal-of-nat-option-list-fix-2-forward-to-nat-option-list-equiv

(defthm
    equal-of-nat-option-list-fix-2-forward-to-nat-option-list-equiv
  (implies (equal x (nat-option-list-fix y))
           (nat-option-list-equiv x y))
  :rule-classes :forward-chaining)

Theorem: nat-option-list-equiv-of-nat-option-list-fix-1-forward

(defthm nat-option-list-equiv-of-nat-option-list-fix-1-forward
  (implies (nat-option-list-equiv (nat-option-list-fix x)
                                  y)
           (nat-option-list-equiv x y))
  :rule-classes :forward-chaining)

Theorem: nat-option-list-equiv-of-nat-option-list-fix-2-forward

(defthm nat-option-list-equiv-of-nat-option-list-fix-2-forward
  (implies (nat-option-list-equiv x (nat-option-list-fix y))
           (nat-option-list-equiv x y))
  :rule-classes :forward-chaining)

Theorem: car-of-nat-option-list-fix-x-under-nat-option-equiv

(defthm car-of-nat-option-list-fix-x-under-nat-option-equiv
  (nat-option-equiv (car (nat-option-list-fix x))
                    (car x)))

Theorem: car-nat-option-list-equiv-congruence-on-x-under-nat-option-equiv

(defthm
   car-nat-option-list-equiv-congruence-on-x-under-nat-option-equiv
  (implies (nat-option-list-equiv x x-equiv)
           (nat-option-equiv (car x)
                             (car x-equiv)))
  :rule-classes :congruence)

Theorem: cdr-of-nat-option-list-fix-x-under-nat-option-list-equiv

(defthm cdr-of-nat-option-list-fix-x-under-nat-option-list-equiv
  (nat-option-list-equiv (cdr (nat-option-list-fix x))
                         (cdr x)))

Theorem: cdr-nat-option-list-equiv-congruence-on-x-under-nat-option-list-equiv

(defthm
 cdr-nat-option-list-equiv-congruence-on-x-under-nat-option-list-equiv
 (implies (nat-option-list-equiv x x-equiv)
          (nat-option-list-equiv (cdr x)
                                 (cdr x-equiv)))
 :rule-classes :congruence)

Theorem: cons-of-nat-option-fix-x-under-nat-option-list-equiv

(defthm cons-of-nat-option-fix-x-under-nat-option-list-equiv
  (nat-option-list-equiv (cons (nat-option-fix x) y)
                         (cons x y)))

Theorem: cons-nat-option-equiv-congruence-on-x-under-nat-option-list-equiv

(defthm
  cons-nat-option-equiv-congruence-on-x-under-nat-option-list-equiv
  (implies (nat-option-equiv x x-equiv)
           (nat-option-list-equiv (cons x y)
                                  (cons x-equiv y)))
  :rule-classes :congruence)

Theorem: cons-of-nat-option-list-fix-y-under-nat-option-list-equiv

(defthm cons-of-nat-option-list-fix-y-under-nat-option-list-equiv
  (nat-option-list-equiv (cons x (nat-option-list-fix y))
                         (cons x y)))

Theorem: cons-nat-option-list-equiv-congruence-on-y-under-nat-option-list-equiv

(defthm
 cons-nat-option-list-equiv-congruence-on-y-under-nat-option-list-equiv
 (implies (nat-option-list-equiv y y-equiv)
          (nat-option-list-equiv (cons x y)
                                 (cons x y-equiv)))
 :rule-classes :congruence)

Theorem: consp-of-nat-option-list-fix

(defthm consp-of-nat-option-list-fix
  (equal (consp (nat-option-list-fix x))
         (consp x)))

Theorem: nat-option-list-fix-under-iff

(defthm nat-option-list-fix-under-iff
  (iff (nat-option-list-fix x) (consp x)))

Theorem: nat-option-list-fix-of-cons

(defthm nat-option-list-fix-of-cons
  (equal (nat-option-list-fix (cons a x))
         (cons (nat-option-fix a)
               (nat-option-list-fix x))))

Theorem: len-of-nat-option-list-fix

(defthm len-of-nat-option-list-fix
  (equal (len (nat-option-list-fix x))
         (len x)))

Theorem: nat-option-list-fix-of-append

(defthm nat-option-list-fix-of-append
  (equal (nat-option-list-fix (append std::a std::b))
         (append (nat-option-list-fix std::a)
                 (nat-option-list-fix std::b))))

Theorem: nat-option-list-fix-of-repeat

(defthm nat-option-list-fix-of-repeat
  (equal (nat-option-list-fix (repeat n x))
         (repeat n (nat-option-fix x))))

Theorem: list-equiv-refines-nat-option-list-equiv

(defthm list-equiv-refines-nat-option-list-equiv
  (implies (list-equiv x y)
           (nat-option-list-equiv x y))
  :rule-classes :refinement)

Theorem: nth-of-nat-option-list-fix

(defthm nth-of-nat-option-list-fix
  (equal (nth n (nat-option-list-fix x))
         (if (< (nfix n) (len x))
             (nat-option-fix (nth n x))
           nil)))

Theorem: nat-option-list-equiv-implies-nat-option-list-equiv-append-1

(defthm nat-option-list-equiv-implies-nat-option-list-equiv-append-1
  (implies (nat-option-list-equiv x fty::x-equiv)
           (nat-option-list-equiv (append x y)
                                  (append fty::x-equiv y)))
  :rule-classes (:congruence))

Theorem: nat-option-list-equiv-implies-nat-option-list-equiv-append-2

(defthm nat-option-list-equiv-implies-nat-option-list-equiv-append-2
  (implies (nat-option-list-equiv y fty::y-equiv)
           (nat-option-list-equiv (append x y)
                                  (append x fty::y-equiv)))
  :rule-classes (:congruence))

Theorem: nat-option-list-equiv-implies-nat-option-list-equiv-nthcdr-2

(defthm nat-option-list-equiv-implies-nat-option-list-equiv-nthcdr-2
  (implies (nat-option-list-equiv l l-equiv)
           (nat-option-list-equiv (nthcdr n l)
                                  (nthcdr n l-equiv)))
  :rule-classes (:congruence))

Theorem: nat-option-list-equiv-implies-nat-option-list-equiv-take-2

(defthm nat-option-list-equiv-implies-nat-option-list-equiv-take-2
  (implies (nat-option-list-equiv l l-equiv)
           (nat-option-list-equiv (take n l)
                                  (take n l-equiv)))
  :rule-classes (:congruence))