Categoricity and u-rank in excellent classes

Journal of Symbolic Logic 68 (4):1317-1336 (2003)
Let K be the class of atomic models of a countable first order theory. We prove that if K is excellent and categorical in some uncountable cardinal, then each model is prime and minimal over the basis of a definable pregeometry given by a quasiminimal set. This implies that K is categorical in all uncountable cardinals. We also introduce a U-rank to measure the complexity of complete types over models. We prove that the U-rank has the usual additivity properties, that quasiminimal types have U-rank 1, and that the U-rank of any type is finite in the uncountably categorical, excellent case. However, in contrast to the first order case, the supremum of the U-rank over all types may be ω (and is not achieved). We illustrate the theory with the example of free groups, and Zilber's pseudo analytic structures
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DOI 10.2178/jsl/1067620189
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References found in this work BETA
Saharon Shelah (1970). Finite Diagrams Stable in Power. Annals of Mathematical Logic 2 (1):69-118.
Tapani Hyttinen (1998). Generalizing Morley's Theorem. Mathematical Logic Quarterly 44 (2):176-184.
Olivier Lessmann (2000). Ranks and Pregeometries in Finite Diagrams. Annals of Pure and Applied Logic 106 (1-3):49-83.

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