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Alonzo Church. Application of recursive arithmetic to the problem of circuit synthesisSummaries of talks presented at the Summer Institute for Symbolic Logic Cornell University, 1957, 2nd edn., Communications Research Division, Institute for Defense Analyses, Princeton, N. J., 1960, pp. 3–50. 3a-45a. - Volume 28 Issue 4
Joyce Friedman (Sun,) studied this question.