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The operator gap theorem in α-recursion theory

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The preparation of this paper was supported in part by a grant from the City University of New York, Faculty Research Award Program.

We wish to acknowledge helpful comments of the referee regarding several expository points.

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Di Paola, R.A. The operator gap theorem in α-recursion theory. Arch math Logik 19, 115–129 (1978). https://doi.org/10.1007/BF02011873

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