stationary setStationarySet2002-07-29 20:16:202002-07-29 20:16:20Definitionstationarystationary setthinthin set% this is the default PlanetMath preamble. as your knowledge
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%\PMlinkescapeword{theory}If $\kappa$ is a cardinal, $C\subseteq\kappa$, and $C$ intersects every club in $\kappa$ then $C$ is \emph{stationary}. If $C$ is not stationary then it is \emph{thin}.