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Top Questions
13
votes
A consequence of zero sharp (successor cardinals having countable cofinality)
logic
set-theory
asked Jun 3, 2015 at 3:37
math.stackexchange.com
11
votes
Borel sets preserved under open maps?
measure-theory
integration
gn.general-topology
asked Sep 11, 2012 at 17:35
mathoverflow.net
10
votes
An exercise in Fine Structure of constructible universe concerning projectum patterns
logic
set-theory
asked Feb 1, 2016 at 3:01
math.stackexchange.com
10
votes
Martin's Maximum implies stationary/club Chang's conjecture?
set-theory
lo.logic
forcing
infinite-combinatorics
asked Mar 2, 2021 at 20:24
mathoverflow.net
9
votes
Countable support iteration of proper forcings and the tree property
set-theory
forcing
asked Feb 15, 2018 at 15:09
mathoverflow.net
9
votes
Cohesive sets with degree below some non-high 1-generic degrees?
computability-theory
lo.logic
asked Feb 7, 2013 at 18:18
mathoverflow.net
9
votes
Existence of $\{\omega, \omega+1,...\}$ via the axiom of replacement
set-theory
ordinals
asked Feb 16, 2013 at 15:46
math.stackexchange.com
8
votes
Cohesive set with degree below non-high Martin-Löf random reals
lo.logic
computability-theory
algorithmic-randomness
asked Aug 21, 2013 at 17:16
mathoverflow.net
8
votes
Iterated forcing and the super tree property at $\omega_2$
set-theory
lo.logic
forcing
infinite-combinatorics
asked Jan 8, 2018 at 14:41
mathoverflow.net
8
votes
Idea behind the proof of consistency of club filter of $\omega_1$ is ultrafilter + ZF + DC
set-theory
forcing
large-cardinals
asked Oct 10, 2015 at 3:58
mathoverflow.net
1
2
3
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Top Answers
9
An informal description of forcing.
math.stackexchange.com
9
What are your favorite instructional counterexamples?
mathoverflow.net
8
Countable support product of Sacks forcings and selective ultrafilters
mathoverflow.net
7
Is it possible for countably closed forcing to collapse $\aleph_2$ to $\aleph_1$ without collapsing the continuum?
mathoverflow.net
7
PFA and saturated ideals
mathoverflow.net
7
Poset dimension and width (Dilworth's theorem)
mathoverflow.net
6
Is axiom of choice necessary for proving that every infinite set has a countably infinite subset?
math.stackexchange.com
6
End-extending cardinals
mathoverflow.net
5
Does PA prove a sentence asserting that all of I-sigma(n) theories are consistent?
mathoverflow.net
5
"Gaps" in the Rudin-Keisler ordering
mathoverflow.net
5
Iterated forcing and the super tree property at $\omega_2$
mathoverflow.net
5
How many disjoint compact sets are needed to form a connected compactum?
mathoverflow.net
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