Complexity Ranks of Countable Models

Notre Dame Journal of Formal Logic 48 (1):33-48 (2007)
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Abstract

We define some variations of the Scott rank for countable models and obtain some inequalities involving the ranks. For mono-unary algebras we prove that the game rank of any subtree does not exceed the game rank of the whole model. However, similar questions about linear orders remain unresolved

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References found in this work

An example concerning Scott heights.M. Makkai - 1981 - Journal of Symbolic Logic 46 (2):301-318.
A complete L ω1ω-sentence characterizing ℵ1.Julia F. Knight - 1977 - Journal of Symbolic Logic 42 (1):59-62.
Some dichotomy theorems for isomorphism relations of countable models.Su Gao - 2001 - Journal of Symbolic Logic 66 (2):902-922.

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