It is proved that the (2$p$)-c. e. e-degrees are not elementarily equivalent to the (2$p$+1)-c. e. e-degrees for each nonzero $p \in \omega$. It follows that $m$-c. e. e-degrees are not elementarily equivalent to the n-c. e. e-degrees if $1 < m < n$.
J. Symbolic Logic
72(1):
277-284
(March 2007).
DOI: 10.2178/jsl/1174668395
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