A Banach–Mazur computable but not Markov computable function on the computable real numbers

Annals of Pure and Applied Logic 132 (2-3):227-246 (2005)
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We consider two classical computability notions for functions mapping all computable real numbers to computable real numbers. It is clear that any function that is computable in the sense of Markov, i.e., computable with respect to a standard Gödel numbering of the computable real numbers, is computable in the sense of Banach and Mazur, i.e., it maps any computable sequence of real numbers to a computable sequence of real numbers. We show that the converse is not true. This solves a long-standing open problem posed by Kushner



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References found in this work

A Comparison of Five “Computable” Operators.Marian Boykan Pour-El - 1960 - Mathematical Logic Quarterly 6 (15‐22):325-340.
A Comparison of Five “Computable” Operators.Marian Boykan Pour-El - 1960 - Mathematical Logic Quarterly 6 (15-22):325-340.
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Classes Récursivement Fermees et Fonctions Majorantes.Daniel Lacombe - 1959 - Journal of Symbolic Logic 24 (1):52-53.

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