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Fundamenta Mathematicae

2014 | 226 | 2 | 143-156

Embedding orders into the cardinals with $DC_{κ}$

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Abstrakty

EN
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 from $DC_{κ}$.

143-156

wydano
2014

Twórcy

autor
• Einstein Institute of Mathematics, Edmond J. Safra Campus, The Hebrew University of Jerusalem, Givat Ram, Jerusalem, 91904, Israel