Question: Professor Marceau objects to the loop invariant used in the proof of Lemma 5.5. They question whether it is true prior to the first iteration.

Professor Marceau objects to the loop invariant used in the proof of Lemma 5.5. They question whether it is true prior to the first iteration. They reason that we could just as easily declare that an empty subarray contains no 0-permutations. Therefore, the probability that an empty subarray contains a 0-permutation should be 0, thus invalidating the loop invariant prior to the first iteration. Rewrite the procedure RANDOMIZE-IN-PLACE so that its associated loop invariant applies to a nonempty subarray prior to the first iteration, and modify the proof of Lemma 5.5 for your procedure.

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