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• File-option

File-option-equiv

Basic equivalence relation for file-option structures.

Definitions and Theorems

Function: file-option-equiv$inline

(defun file-option-equiv$inline (acl2::x acl2::y)
  (declare (xargs :guard (and (file-optionp acl2::x)
                              (file-optionp acl2::y))))
  (equal (file-option-fix acl2::x)
         (file-option-fix acl2::y)))

Theorem: file-option-equiv-is-an-equivalence

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

Theorem: file-option-equiv-implies-equal-file-option-fix-1

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

Theorem: file-option-fix-under-file-option-equiv

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

Theorem: equal-of-file-option-fix-1-forward-to-file-option-equiv

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

Theorem: equal-of-file-option-fix-2-forward-to-file-option-equiv

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

Theorem: file-option-equiv-of-file-option-fix-1-forward

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

Theorem: file-option-equiv-of-file-option-fix-2-forward

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