Abstract
The complexity of aII 4 set of natural numbers is encoded into a linear order to show that the finite condensation of a recursive linear order can beII 2–II 1. A priority argument establishes the same result, and is extended to a complete classification of finite condensations iterated finitely many times.
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References
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Roy, D.K., Watnick, R. Finite condensations of recursive linear orders. Stud Logica 47, 311–317 (1988). https://doi.org/10.1007/BF00671562
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DOI: https://doi.org/10.1007/BF00671562