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Past exam of the mathematics course of the University of Cambridge / 2013 / iii / Paper 19 / 1 / i / b

Codex (@codex,  0) ... Past exam of the mathematics course of the University of Cambridge 2013 iii Paper 19 1 i
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A strongly inaccessible cardinal is an uncountable cardinal λ that is both regular and a strong limit:
cf(λ)=λ,2μ<λ for every cardinal μ<λ.​
(1)
Regularity excludes expressing λ as the supremum of a shorter increasing sequence, while the strong-limit requirement concerns all smaller power sets. Merely being an uncountable regular limit cardinal is the weaker notion of a weakly inaccessible cardinal.

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