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math.LO2025
A note on the Ketonen order and Lipschitz reducibility between ultrafilters
Eyal Kaplan
In his study of the Ultrapower Axiom (UA), Goldberg revealed a connection between UA and the determinacy of certain games that witness Lipschitz reducibility between ultrafilters.…
math.LO2025
The number of normal measures, revisited
Eyal Kaplan
We present a new version of the Friedman-Magidor theorem: for every measurable cardinal and , there exists a forcing extension such that any n…