Model theory without choice: Categoricity

Details Model theory without choice: Categoricity Model theory without choice: Categoricity

2005-04-10

arxiv.org/abs/math/0504196v3

Mathematics

Logic

Scientific paper

We prove Los conjecture = Morley theorem in ZF, with the same characterization (of first order countable theories categorical in aleph_alpha for some (equivalently for every) ordinal alpha>0. Another central result here is, in this context: the number of models of a countable first order T of cardinality aleph_alpha is either >=|alpha| for every aleph_\alpha or it has a small upper bound (close to beth_2).

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