Encyclopedia > Strongly inaccessible cardinal

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Strongly inaccessible cardinal

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

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

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

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