From Cantor's Attic
Revision as of 07:51, 3 January 2012 by Jdh
An uncountable cardinal $\kappa$ is measurable when there is a measure on $\kappa$, that is, a $\kappa$-complete non-principal ultrafilter on $\kappa$.
Measurable cardinals were first defined by Stanislaw Ulam.
Related cardinal notions
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