Extenders under ZF and constructibility of rank-to-rank embeddings.
Extenders under ZF and constructibility of rank-to-rank embeddings.
复制标题
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:
--
通讯作者:
Farmer Schlutzenberg
中科院分区:
文献类型:
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作者:
Farmer Schlutzenberg
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.
DOI:
10.1017/bsl.2019.28
发表时间:
2019
期刊:
The Bulletin of Symbolic Logic
影响因子:
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作者:
BAGARIA, JOAN;KOELLNER, PETER;WOODIN, W. HUGH
通讯作者:
WOODIN, W. HUGH
影响因子:
2.6
作者:
Goldberg, Gabriel;Schlutzenberg, Farmer
通讯作者:
Schlutzenberg, Farmer