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• Bitops/signed-byte-p

Lousy-unsigned-byte-p-of-*

Multiplying N * N bit unsigneds creates an N+N bit unsigned.

This is a common case of lousy-unsigned-byte-p-of-*-mixed, but it also rarely unifies with anything. See also basic-unsigned-byte-p-of-*.

Definitions and Theorems

Theorem: lousy-unsigned-byte-p-of-*

(defthm lousy-unsigned-byte-p-of-*
  (implies (and (unsigned-byte-p n a)
                (unsigned-byte-p n b))
           (unsigned-byte-p (+ n n) (* a b))))