9 research outputs found
Increasing the second uniform indiscernible by strongly ssp forcing
We introduce a new and natural stationary set preserving forcing that (under precipitous + existence of
H_{\theta}^# for a sufficiently large regular ) increases the
second uniform indiscernible beyond some given ordinal . The
forcing shares this property with forcings defined in [9] and
[2]. As a main tool we use certain natural open two player games which are of
independent interest, viz. the capturing games and the
catching-capturing games . In particular, these games are used to
isolate a special family of countable elementary submodels
that occur as side conditions in and thus allow to control
the forcing in a strong way
Incompatible bounded category forcing axioms
We introduce bounded category forcing axioms for well-behaved classes
. These are strong forms of bounded forcing axioms which completely
decide the theory of some initial segment of the universe
modulo forcing in , for some cardinal
naturally associated to . These axioms naturally
extend projective absoluteness for arbitrary set-forcing--in this situation
--to classes with .
Unlike projective absoluteness, these higher bounded category forcing axioms do
not follow from large cardinal axioms, but can be forced under mild large
cardinal assumptions on . We also show the existence of many classes
with , and giving rise to pairwise
incompatible theories for .Comment: arXiv admin note: substantial text overlap with arXiv:1805.0873
Set theory and the analyst
This survey is motivated by specific questions arising in the similarities and contrasts between (Baire) category and (Lebesgue) measure - category-measure duality and non-duality, as it were. The bulk of the text is devoted to a summary, intended for the working analyst, of the extensive background in set theory and logic needed to discuss such matters: to quote from the Preface of Kelley [Kel]: "what every young analyst should know"