Embedding Orders Into Cardinals With DCκDC_κ

preprint2014arXivOpen access

Abstract

Jech proved that every partially ordered set can be embedded into the cardinals of some model of ZFZF. We extend this result to show that every partially ordered set can be embedded into the cardinals of some model of ZF+DC<κZF+DC_{<κ} for any regular κκ. We use this theorem to show that for all κκ, the assumption of DCκDC_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 WISCWISC.

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