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Elementary differences between the (2p)-C. E. and the (2p +1)-c. e. enumeration degrees
Published online by Cambridge University Press: 12 March 2014
Abstract
It is proved that the (2p)-c. e. e-degrees are not elementarily equivalent to the (2p + 1)-c. e. e-degrees for each nonzero p ∈ ω. It follows that m-c. e. e-degrees are not elementarily equivalent to the n-c e. e-degrees if 1 <m < n.
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- Copyright © Association for Symbolic Logic 2007
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