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A game-theoretic proof of Shelah's theorem on labeled trees
Mathematical Logic Quarterly ( IF 0.3 ) Pub Date : 2020-06-16 , DOI: 10.1002/malq.201900060
Trevor M. Wilson 1
Affiliation  

We give a new proof of a theorem of Shelah which states that for every family of labeled trees, if the cardinality $\kappa$ of the family is much larger (in the sense of large cardinals) than the cardinality $\lambda$ of the set of labels, more precisely if the partition relation $\kappa \to (\omega)^{\mathord{<}\omega}_\lambda$ holds, then there is a homomorphism from one labeled tree in the family to another. Our proof uses a characterization of such homomorphisms in terms of games.

中文翻译:

Shelah 定理在标记树上的博弈论证明

我们给出了 Shelah 定理的一个新证明,该定理指出,对于每个标记树家族,如果该家族的基数 $\kappa$ 比大基数的基数 $\lambda$ 大得多(在大基数的意义上)一组标签,更准确地说,如果分区关系 $\kappa \to (\omega)^{\mathord{<}\omega}_\lambda$ 成立,那么从家族中的一个标记树到另一个存在同态。我们的证明在游戏方面使用了这种同态的特征。
更新日期:2020-06-16
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