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- W2884086238 abstract "Abstract It is proved that for every countable structure and a computable successor ordinal α there is a countable structure which is ‐least among all countable structures such that is Σ‐definable in the αth jump . We also show that this result does not hold for the limit ordinal . Moreover, we prove that there is no countable structure with the degree spectrum for ." @default.
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- W2884086238 date "2019-05-01" @default.
- W2884086238 modified "2023-10-18" @default.
- W2884086238 title "Jump inversions of algebraic structures and Σ‐definability" @default.
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- W2884086238 doi "https://doi.org/10.1002/malq.201800015" @default.
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