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Byte-list20

A fixtype of true lists of (unsigned 8-bit) bytes of length 20.

Definitions and Theorems

Function: byte-list20-equiv$inline

(defun byte-list20-equiv$inline (x y)
  (declare (xargs :guard (and (byte-list20p x)
                              (byte-list20p y))))
  (equal (byte-list20-fix x)
         (byte-list20-fix y)))

Theorem: byte-list20-equiv-is-an-equivalence

(defthm byte-list20-equiv-is-an-equivalence
  (and (booleanp (byte-list20-equiv x y))
       (byte-list20-equiv x x)
       (implies (byte-list20-equiv x y)
                (byte-list20-equiv y x))
       (implies (and (byte-list20-equiv x y)
                     (byte-list20-equiv y z))
                (byte-list20-equiv x z)))
  :rule-classes (:equivalence))

Theorem: byte-list20-equiv-implies-equal-byte-list20-fix-1

(defthm byte-list20-equiv-implies-equal-byte-list20-fix-1
  (implies (byte-list20-equiv x x-equiv)
           (equal (byte-list20-fix x)
                  (byte-list20-fix x-equiv)))
  :rule-classes (:congruence))

Theorem: byte-list20-fix-under-byte-list20-equiv

(defthm byte-list20-fix-under-byte-list20-equiv
  (byte-list20-equiv (byte-list20-fix x)
                     x)
  :rule-classes (:rewrite :rewrite-quoted-constant))

Theorem: equal-of-byte-list20-fix-1-forward-to-byte-list20-equiv

(defthm equal-of-byte-list20-fix-1-forward-to-byte-list20-equiv
  (implies (equal (byte-list20-fix x) y)
           (byte-list20-equiv x y))
  :rule-classes :forward-chaining)

Theorem: equal-of-byte-list20-fix-2-forward-to-byte-list20-equiv

(defthm equal-of-byte-list20-fix-2-forward-to-byte-list20-equiv
  (implies (equal x (byte-list20-fix y))
           (byte-list20-equiv x y))
  :rule-classes :forward-chaining)

Theorem: byte-list20-equiv-of-byte-list20-fix-1-forward

(defthm byte-list20-equiv-of-byte-list20-fix-1-forward
  (implies (byte-list20-equiv (byte-list20-fix x)
                              y)
           (byte-list20-equiv x y))
  :rule-classes :forward-chaining)

Theorem: byte-list20-equiv-of-byte-list20-fix-2-forward

(defthm byte-list20-equiv-of-byte-list20-fix-2-forward
  (implies (byte-list20-equiv x (byte-list20-fix y))
           (byte-list20-equiv x y))
  :rule-classes :forward-chaining)

Subtopics

Byte-list20p

Recognizer for byte-list20.

Byte-list20-fix

Fixer for byte-list20.