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Results tagged with reference-request
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user 26705
This tag is used if a reference is needed in a paper or textbook on a specific result.
8
votes
Examples of set theory problems which are solved using methods outside of logic
Inspired by Joel David Hamkin's comment---Simon Thomas has provided applications of various super-ridigity theorems (from the ergodic theory of group actions) to the theory of the Borel complexity of …
- 2,146
9
votes
Accepted
Which reals are "hyperarithmetic modulo ordinals"?
In fact $\Delta^{1, ord}_1 = \mathbb{L} \cap \mathbb{R}$.
For suppose $(\phi(x, \overline{y})$, $\psi(x, \overline{y})$, $\overline{\alpha})$ is as you describe, defining $r \subset \omega$. We show …
- 2,146