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单词 FodorsLemma
释义

Fodor’s lemma


If κ is a regularPlanetmathPlanetmath, uncountable cardinal, S is a stationary subset of κ, and f:κκ is regressive on S (that is, f(α)<α for any αS) then there is some γ and some stationary S0S such that f(α)=γ for any αS0.

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