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Expr

Expr-equiv

Basic equivalence relation for expr structures.

Definitions and Theorems

Function: expr-equiv$inline

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

Theorem: expr-equiv-is-an-equivalence

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

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

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

Theorem: expr-fix-under-expr-equiv

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

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

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

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

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

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

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

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

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