Extenders under ZF and constructibility of rank-to-rank embeddings.

Extenders under ZF and constructibility of rank-to-rank embeddings.
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ZF 下的扩展器和排名嵌入的可构造性。

DOI:
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发表时间:
2020
期刊:
影响因子:
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通讯作者:
Farmer Schlutzenberg
Farmer Schlutzenberg
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作者:
Farmer Schlutzenberg

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假设ZF(没有选择公理)。设$j:V_\delta\to V_\delta$是一个非平凡的$\Sigma_1$-初等嵌入,其中$\delta$是一个极限序数。我们证明了$j$从$V_\delta$的可构造性的一些基本限制;特别地,如果$j\在L(V_\delta)$中,则$\delta$具有不可数共尾性。然而,我们证明了,假设一个$I_3$-嵌入,有适当的$\delta,j$,有可能在L(V_\delta)$中有$j\。假设依赖选择和$\delta$具有可数共尾性(但不假设$V=L(V_\delta)$),并且$j$如上所述,我们证明了这样的嵌入的集合具有高复杂性,并且有“完美的许多”这样的嵌入。我们还表明,ZF定理的铃木,没有小学$j:V\V$是可定义的参数,实际上是从一个理论弱于ZF。的主要结果依赖于ZF下,我们也给扩展的发展。
Assume ZF (without the Axiom of Choice). Let $j:V_\delta\to V_\delta$ be a non-trivial $\Sigma_1$-elementary embedding, where $\delta$ is a limit ordinal. We prove some basic restrictions on the constructibility of $j$ from $V_\delta$; in particular, if $j\in L(V_\delta)$ then $\delta$ has uncountable cofinality. We show that, however, assuming an $I_3$-embedding, with the appropriate $\delta,j$, it is possible to have $j\in L(V_\delta)$. Assuming Dependent Choice and that $\delta$ has countable cofinality (but not assuming $V=L(V_\delta)$), and $j$ is as above, we show that the collection of such embeddings is of high complexity, and that there are "perfectly many" such embeddings. We also show that a ZF theorem of Suzuki, that no elementary $j:V\to V$ is definable from parameters, actually follows from a theory weaker than ZF. The main results rely on a development of extenders under ZF, which we also give.
大红衣主教无可选择
DOI: 10.1017/bsl.2019.28
发表时间: 2019
期刊: The Bulletin of Symbolic Logic
影响因子: --
作者:
BAGARIA, JOAN;KOELLNER, PETER;WOODIN, W. HUGH
通讯作者: WOODIN, W. HUGH
累积层次结构中的周期性
DOI: 10.4171/jems/1318
发表时间: 2023
影响因子: 2.6
作者:
Goldberg, Gabriel;Schlutzenberg, Farmer
通讯作者: Schlutzenberg, Farmer