regular cardinal (Q1193137)
cardinal number that equals its own cofinality
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Current Data About regular cardinal
(P279) (Q163875)
(P2534) |I|<\kappa\land(\forall i\in I\colon|S_i|<\kappa)\implies\left|\bigcup_{i\in I}S\right|<\kappa
(P6104) (Q8487137)
other details