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arxiv: 1209.1133 · v1 · pith:DT4ZNO3Hnew · submitted 2012-09-05 · 🧮 math.LO

Easton's Theorem for Ramsey and Strongly Ramsey cardinals

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keywords ramseyalphadeltakappastronglybetacardinalcardinals
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We show that, assuming GCH, if $\kappa$ is a Ramsey or a strongly Ramsey cardinal and $F$ is a class function on the regular cardinals having a closure point at $\kappa$ and obeying the constraints of Easton's theorem, namely, $F(\alpha)\leq F(\beta)$ for $\alpha\leq\beta$ and $\alpha<\cf(F(\alpha))$, then there is a cofinality preserving forcing extension in which $\kappa$ remains Ramsey or strongly Ramsey respectively and $2^\delta=F(\delta)$ for every regular cardinal $\delta$.

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