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• Bitops/signed-byte-p

Unsigned-byte-p-of-abs-when-signed-byte-p

Absolute value of an N-bit signed is an N-bit unsigned.

Definitions and Theorems

Theorem: unsigned-byte-p-of-abs-when-signed-byte-p

(defthm unsigned-byte-p-of-abs-when-signed-byte-p
  (implies (signed-byte-p n x)
           (unsigned-byte-p n (abs x))))