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zero error probability in polynomial time (ZPP)

The class of languages for which a membership computation by a probabilistic Turing machine halts in polynomial time with no false acceptances or rejections, but randomly some "I don't know" answers. Formal Definition: For a language, S, there exists a probabilistic Turing machine, M, that halts in polynomial time. M (correctly) accepts or rejects the string or, randomly, halts in an "I don't know" state.

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