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In mathematics, computer science, telecommunication, information theory, and searching theory, error-correcting codes with noiseless feedback has great practical importance. An error correcting code with noiseless feedback is equivalent to an adaptive searching strategy with errors.
In 1956 Claude Shannon introduced the discrete memoryless channel with noiseless feedback. In 1961 Alfréd Rényi introduced the Bar-Kochba game with a given percentage of wrong answers. In 1964 Elwyn Berlekamp considered in his dissertation error correcting codes with noiseless feedback.