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• Lhs

Lhs-fix

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

Signature

(lhs-fix x) → fty::newx

Arguments

x — Guard (lhs-p x).

Returns

fty::newx — Type (lhs-p fty::newx).

In the logic, we apply lhrange-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: lhs-fix$inline

(defun lhs-fix$inline (x)
       (declare (xargs :guard (lhs-p x)))
       (let ((__function__ 'lhs-fix))
            (declare (ignorable __function__))
            (mbe :logic (if (atom x)
                            nil
                            (cons (lhrange-fix (car x))
                                  (lhs-fix (cdr x))))
                 :exec x)))

Theorem: lhs-p-of-lhs-fix

(defthm lhs-p-of-lhs-fix
        (b* ((fty::newx (lhs-fix$inline x)))
            (lhs-p fty::newx))
        :rule-classes :rewrite)

Theorem: lhs-fix-when-lhs-p

(defthm lhs-fix-when-lhs-p
        (implies (lhs-p x)
                 (equal (lhs-fix x) x)))

Function: lhs-equiv$inline

(defun lhs-equiv$inline (x y)
       (declare (xargs :guard (and (lhs-p x) (lhs-p y))))
       (equal (lhs-fix x) (lhs-fix y)))

Theorem: lhs-equiv-is-an-equivalence

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

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

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

Theorem: lhs-fix-under-lhs-equiv

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

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

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

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

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

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

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

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

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

Theorem: car-of-lhs-fix-x-under-lhrange-equiv

(defthm car-of-lhs-fix-x-under-lhrange-equiv
        (lhrange-equiv (car (lhs-fix x))
                       (car x)))

Theorem: car-lhs-equiv-congruence-on-x-under-lhrange-equiv

(defthm car-lhs-equiv-congruence-on-x-under-lhrange-equiv
        (implies (lhs-equiv x x-equiv)
                 (lhrange-equiv (car x) (car x-equiv)))
        :rule-classes :congruence)

Theorem: cdr-of-lhs-fix-x-under-lhs-equiv

(defthm cdr-of-lhs-fix-x-under-lhs-equiv
        (lhs-equiv (cdr (lhs-fix x)) (cdr x)))

Theorem: cdr-lhs-equiv-congruence-on-x-under-lhs-equiv

(defthm cdr-lhs-equiv-congruence-on-x-under-lhs-equiv
        (implies (lhs-equiv x x-equiv)
                 (lhs-equiv (cdr x) (cdr x-equiv)))
        :rule-classes :congruence)

Theorem: cons-of-lhrange-fix-x-under-lhs-equiv

(defthm cons-of-lhrange-fix-x-under-lhs-equiv
        (lhs-equiv (cons (lhrange-fix x) y)
                   (cons x y)))

Theorem: cons-lhrange-equiv-congruence-on-x-under-lhs-equiv

(defthm cons-lhrange-equiv-congruence-on-x-under-lhs-equiv
        (implies (lhrange-equiv x x-equiv)
                 (lhs-equiv (cons x y) (cons x-equiv y)))
        :rule-classes :congruence)

Theorem: cons-of-lhs-fix-y-under-lhs-equiv

(defthm cons-of-lhs-fix-y-under-lhs-equiv
        (lhs-equiv (cons x (lhs-fix y))
                   (cons x y)))

Theorem: cons-lhs-equiv-congruence-on-y-under-lhs-equiv

(defthm cons-lhs-equiv-congruence-on-y-under-lhs-equiv
        (implies (lhs-equiv y y-equiv)
                 (lhs-equiv (cons x y) (cons x y-equiv)))
        :rule-classes :congruence)

Theorem: consp-of-lhs-fix

(defthm consp-of-lhs-fix
        (equal (consp (lhs-fix x)) (consp x)))

Theorem: lhs-fix-under-iff

(defthm lhs-fix-under-iff
        (iff (lhs-fix x) (consp x)))

Theorem: lhs-fix-of-cons

(defthm lhs-fix-of-cons
        (equal (lhs-fix (cons a x))
               (cons (lhrange-fix a) (lhs-fix x))))

Theorem: len-of-lhs-fix

(defthm len-of-lhs-fix
        (equal (len (lhs-fix x)) (len x)))

Theorem: lhs-fix-of-append

(defthm lhs-fix-of-append
        (equal (lhs-fix (append std::a std::b))
               (append (lhs-fix std::a)
                       (lhs-fix std::b))))

Theorem: lhs-fix-of-repeat

(defthm lhs-fix-of-repeat
        (equal (lhs-fix (repeat acl2::n x))
               (repeat acl2::n (lhrange-fix x))))

Theorem: list-equiv-refines-lhs-equiv

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

Theorem: nth-of-lhs-fix

(defthm nth-of-lhs-fix
        (equal (nth acl2::n (lhs-fix x))
               (if (< (nfix acl2::n) (len x))
                   (lhrange-fix (nth acl2::n x))
                   nil)))

Theorem: lhs-equiv-implies-lhs-equiv-append-1

(defthm lhs-equiv-implies-lhs-equiv-append-1
        (implies (lhs-equiv x fty::x-equiv)
                 (lhs-equiv (append x y)
                            (append fty::x-equiv y)))
        :rule-classes (:congruence))

Theorem: lhs-equiv-implies-lhs-equiv-append-2

(defthm lhs-equiv-implies-lhs-equiv-append-2
        (implies (lhs-equiv y fty::y-equiv)
                 (lhs-equiv (append x y)
                            (append x fty::y-equiv)))
        :rule-classes (:congruence))

Theorem: lhs-equiv-implies-lhs-equiv-nthcdr-2

(defthm lhs-equiv-implies-lhs-equiv-nthcdr-2
        (implies (lhs-equiv acl2::l l-equiv)
                 (lhs-equiv (nthcdr acl2::n acl2::l)
                            (nthcdr acl2::n l-equiv)))
        :rule-classes (:congruence))

Theorem: lhs-equiv-implies-lhs-equiv-take-2

(defthm lhs-equiv-implies-lhs-equiv-take-2
        (implies (lhs-equiv acl2::l l-equiv)
                 (lhs-equiv (take acl2::n acl2::l)
                            (take acl2::n l-equiv)))
        :rule-classes (:congruence))