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AML
2005
65views more  AML 2005»
13 years 3 months ago
Middle diamond
Under certain cardinal arithmetic assumptions, we prove that for every large enough regular cardinal, for many regular < , many stationary subsets of concentrating on cofinali...
Saharon Shelah
APAL
2006
67views more  APAL 2006»
13 years 3 months ago
Adding clubs with square
We present a technique for destroying stationary subsets of P+ using partial square sequences. We combine this method with Gitik's poset for changing the cofinality of a cardi...
John Krueger
APAL
2007
90views more  APAL 2007»
13 years 3 months ago
Guessing and non-guessing of canonical functions
It is possible to control to a large extent, via semiproper forcing, the parameters (β0, β1) measuring the guessing density of the members of any given antichain of stationary s...
David Asperó