Embedding Orders Into Cardinals With $DC_κ$

Asaf Karagila

doi:10.4064/fm226-2-4

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arXiv · 1212.4396

Embedding Orders Into Cardinals With $DC_κ$

Asaf Karagila

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Abstract

Jech proved that every partially ordered set can be embedded into the cardinals of some model of $ZF$. We extend this result to show that every partially ordered set can be embedded into the cardinals of some model of $ZF+DC_{<κ}$ for any regular $κ$. We use this theorem to show that for all $κ$, the assumption of $DC_κ$ does not entail that there are no decreasing chains of cardinals. We also show how to extend the result to and embed into the cardinals a proper class which is definable over the ground model. We use this extension to give a large cardinals-free proof of independence of the weak choice principle known as $WISC$.

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BibTeX RIS

Asaf Karagila. 2014-06-15. Embedding Orders Into Cardinals With $DC_κ$. https://doi.org/10.4064/fm226-2-4

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