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Strongly inaccessible cardinal

A cardinal number κ > ‭א‬₀ is called strongly inaccessible iff the following conditions hold:

κ is weakly inaccessible; that is, cf(κ) = κ.
κ is a strong limit, that is, 2^λ < κ for all λ < κ.

Assuming that ZFC is consistent, the existence of strongly inaccessible cardinals provably cannot be proved in ZFC.

Under the Generalized Continuum Hypothesis, a cardinal is strongly inaccessible iff it is weakly inaccessible.

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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Strongly inaccessible cardinal".