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In mathematics, Ψ0(Ωω) is a large countable ordinal that is used to measure the proof-theoretic strength of some mathematical systems. In particular, it is the proof theoretic ordinal of the subsystem -CA0 of second-order arithmetic; this is one of the "big five" subsystems studied in reverse mathematics (Simpson 1999). ==Definition== (詳細はウィキペディア(Wikipedia)』 ■ウィキペディアで「Ψ₀(Ωω)」の詳細全文を読む スポンサード リンク
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