Covering Property Axiom CPAcube and its consequences
by
Krzysztof Ciesielski,
and J. Pawlikowski
Fund. Math. 176(1) (2003), 63-75.
In the paper we formulate a Covering Property Axiom CPAcube,
which holds in the iterated perfect set model,
and show that it implies easily the following facts.
-
For every subset S of R of cardinality continuum there exists a uniformly
continuous function g:R-->R with g[S]=[0,1].
- If a subset S of R is either perfectly meager or universally null
then S has cardinality less than continuum.
- The cofinality of the measure ideal is \omega1.
- For every uniformly bounded sequence
fn:R-->R of Borel
functions there are the sequences:
{P\xi:\xi<\omega1} of compact subsets of R
and
{W\xi:\xi<\omega1} of infinite subsets of \omega
such that the sets P\xi cover R and for every
\xi<\omega1:
{fn|P\xi: n in W\xi} is a monotone uniformly
convergent sequence of uniformly continuous functions.
- Total failure of Martin's Axiom:
\continuum>\omega1 and
for every non-trivial ccc forcing P there
exists \omega1-many dense sets in P such
that no filter intersects all of them.
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Last modified June 4, 2003.