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• Sbyte4-list

Sbyte4-list-equiv

Basic equivalence relation for sbyte4-list structures.

Definitions and Theorems

Function: sbyte4-list-equiv$inline

(defun sbyte4-list-equiv$inline (x y)
  (declare (xargs :guard (and (sbyte4-listp x)
                              (sbyte4-listp y))))
  (equal (sbyte4-list-fix x)
         (sbyte4-list-fix y)))

Theorem: sbyte4-list-equiv-is-an-equivalence

(defthm sbyte4-list-equiv-is-an-equivalence
  (and (booleanp (sbyte4-list-equiv x y))
       (sbyte4-list-equiv x x)
       (implies (sbyte4-list-equiv x y)
                (sbyte4-list-equiv y x))
       (implies (and (sbyte4-list-equiv x y)
                     (sbyte4-list-equiv y z))
                (sbyte4-list-equiv x z)))
  :rule-classes (:equivalence))

Theorem: sbyte4-list-equiv-implies-equal-sbyte4-list-fix-1

(defthm sbyte4-list-equiv-implies-equal-sbyte4-list-fix-1
  (implies (sbyte4-list-equiv x x-equiv)
           (equal (sbyte4-list-fix x)
                  (sbyte4-list-fix x-equiv)))
  :rule-classes (:congruence))

Theorem: sbyte4-list-fix-under-sbyte4-list-equiv

(defthm sbyte4-list-fix-under-sbyte4-list-equiv
  (sbyte4-list-equiv (sbyte4-list-fix x)
                     x)
  :rule-classes (:rewrite :rewrite-quoted-constant))

Theorem: equal-of-sbyte4-list-fix-1-forward-to-sbyte4-list-equiv

(defthm equal-of-sbyte4-list-fix-1-forward-to-sbyte4-list-equiv
  (implies (equal (sbyte4-list-fix x) y)
           (sbyte4-list-equiv x y))
  :rule-classes :forward-chaining)

Theorem: equal-of-sbyte4-list-fix-2-forward-to-sbyte4-list-equiv

(defthm equal-of-sbyte4-list-fix-2-forward-to-sbyte4-list-equiv
  (implies (equal x (sbyte4-list-fix y))
           (sbyte4-list-equiv x y))
  :rule-classes :forward-chaining)

Theorem: sbyte4-list-equiv-of-sbyte4-list-fix-1-forward

(defthm sbyte4-list-equiv-of-sbyte4-list-fix-1-forward
  (implies (sbyte4-list-equiv (sbyte4-list-fix x)
                              y)
           (sbyte4-list-equiv x y))
  :rule-classes :forward-chaining)

Theorem: sbyte4-list-equiv-of-sbyte4-list-fix-2-forward

(defthm sbyte4-list-equiv-of-sbyte4-list-fix-2-forward
  (implies (sbyte4-list-equiv x (sbyte4-list-fix y))
           (sbyte4-list-equiv x y))
  :rule-classes :forward-chaining)