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Outcome

Outcome-equiv

Basic equivalence relation for outcome structures.

Definitions and Theorems

Function: outcome-equiv$inline

(defun outcome-equiv$inline (acl2::x acl2::y)
  (declare (xargs :guard (and (outcomep acl2::x)
                              (outcomep acl2::y))))
  (equal (outcome-fix acl2::x)
         (outcome-fix acl2::y)))

Theorem: outcome-equiv-is-an-equivalence

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

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

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

Theorem: outcome-fix-under-outcome-equiv

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

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

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

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

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

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

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

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

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