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• Ascii

Ascii-fix

Fixer for ascii.

Signature

(ascii-fix x) → fixed-x

Arguments

x — Guard (asciip x).

Returns

fixed-x — Type (asciip fixed-x).

Definitions and Theorems

Function: ascii-fix

(defun ascii-fix (x)
  (declare (xargs :guard (asciip x)))
  (mbe :logic (if (asciip x) x 0)
       :exec x))

Theorem: asciip-of-ascii-fix

(defthm asciip-of-ascii-fix
  (b* ((fixed-x (ascii-fix x)))
    (asciip fixed-x))
  :rule-classes :rewrite)

Theorem: ascii-fix-when-asciip

(defthm ascii-fix-when-asciip
  (implies (asciip x)
           (equal (ascii-fix x) x)))