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Kurt Bing. On arithmetical classes not closed under direct union. Proceedings of the American Mathematical Society, vol. 6 (1955), pp. 836–846.
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Kurt Bing. On arithmetical classes not closed under direct union. Proceedings of the American Mathematical Society, vol. 6 (1955), pp. 836–846.
Published online by Cambridge University Press: 12 March 2014
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- Copyright © Association for Symbolic Logic 1956