ℶ

Character ℶ BET SYMBOL U+2136 Letterlike Symbols \beth

Translingual

Symbol

(English symbol name beth)

1. (set theory) Symbol for the cardinality of an infinite set in a iterative hierarchy of power sets, starting with ℵ₀. Usually indexed by an ordinal number.
$\beth_0=\aleph_0$, $\beth_{\alpha+1}=2^{\beth_{\alpha}},$ and $\beth_\lambda = \sup \{ \beth_\alpha : \alpha < \lambda \}$ for a limit ordinal λ.