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ON CUTS IN ULTRAPRODUCTS OF LINEAR ORDERS II
Published online by Cambridge University Press: 01 May 2018
Abstract
We continue our study of the class 
${\cal C}\left( D \right)$, where D is a uniform ultrafilter on a cardinal κ and 
${\cal C}\left( D \right)$ is the class of all pairs 
$\left( {{\theta _1},{\theta _2}} \right)$, where 
$\left( {{\theta _1},{\theta _2}} \right)$ is the cofinality of a cut in 
${J^\kappa }/D$ and J is some 
${\left( {{\theta _1} + {\theta _2}} \right)^ + }$-saturated dense linear order. We give a combinatorial characterization of the class 
${\cal C}\left( D \right)$. We also show that if 
$\left( {{\theta _1},{\theta _2}} \right) \in {\cal C}\left( D \right)$ and D is 
${\aleph _1}$-complete or 
${\theta _1} + {\theta _2} > {2^\kappa }$, then 
${\theta _1} = {\theta _2}$.
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- Copyright © The Association for Symbolic Logic 2018
References
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