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Answers
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28
What the heck is the Continuum Hypothesis doing in Weibel’s Homological Algebra?
23
The half-life of a theorem, or Arnold’s principle at work
13
Example of two structures
11
Cohen reals and strong measure zero sets
8
Additive Subgroups of the Reals.
8
Tree Version of Hechler Forcing
8
Defining the slowest divergent series
8
Shortest irrational path
7
extensions of lebesgue measure
7
Haar measures in Solovay’s model
7
A compactness property for Borel sets
6
Spaces of filters
6
Are there examples of statements that have been proven whose consistency proofs came before their proofs?
5
Mutually generics
5
Unique Existence and the Axiom of Choice
5
Can the partial sums of a series be uniformly distributed modulo 1?
5
Cardinality of the set of countable dense subgroups of the reals up to isomorphism.
5
Heights of several interesting posets
4
Images of Borel subsets of non-metric compact spaces
4
Cardinality of connected manifolds
4
Universal sets in metric spaces
4
Which notions of forcing add a cofinal branch to an $\omega_1$-tree?
4
Do (Banach) ultrapowers carry some sort of ‘elementary equivalence’?
4
A model of CH +$\lnot \diamondsuit$
4
Are there q-filters which are not ultrafilters?
3
Antichains and measure-preserving actions on Boolean algebras
3
An example of a beautiful proof that would be accessible at the high school level?
3
Ultrafilter and contracting maps
3
Ultraproduct of n-dimensional Banach spaces and algebras
2
Mathematical ideas named after places
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