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An ordinal is the order type of a well-ordered set. The first few ordinals are $0, 1, 2, \dots, \omega, \omega+1, \dots$ where $\omega$ is the order type of $\mathbb{N}$, and $\omega+1$ is the order type of $\mathbb{N}$ together with a maximum element.

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What comes after the Bachmann Howard Ordinal?

I've read and known what the FGH is all the way up to a>Bachmann Howard ordinal which is ψ(Ω_2), the Googology Wiki, Wikipedia, Chris Bird articles, and YouTube don't show how the Fast Growing Hierarc …
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