No CrossRef data available.
Published online by Cambridge University Press: 01 May 2018
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
${\theta _1} = {\theta _2}$.