I introduce a simple device to investigate the combinatorics of singular cardinals above a strongly compact or assuming strong forcing axioms. In particular I obtain an elementary proof of SCH from PFA and several constraints on the possible scenarios to change cofinalities while preserving forcing axioms or strongly compact cardinals.
A family of covering properties for forcing axioms and strongly compact cardinals
22.03.2007 15:00 - 16:30
Organiser:
KGRC
Location:
SR 101, 2. St., Währinger Str. 25