Search Results
| Search type | Search syntax |
|---|---|
| Tags | [tag] |
| Exact | "words here" |
| Author |
user:1234 user:me (yours) |
| Score |
score:3 (3+) score:0 (none) |
| Answers |
answers:3 (3+) answers:0 (none) isaccepted:yes hasaccepted:no inquestion:1234 |
| Views | views:250 |
| Code | code:"if (foo != bar)" |
| Sections |
title:apples body:"apples oranges" |
| URL | url:"*.example.com" |
| Saves | in:saves |
| Status |
closed:yes duplicate:no migrated:no wiki:no |
| Types |
is:question is:answer |
| Exclude |
-[tag] -apples |
| For more details on advanced search visit our help page | |
Results tagged with set-theory
Search options not deleted
user 73785
forcing, large cardinals, descriptive set theory, infinite combinatorics, cardinal characteristics, forcing axioms, ultrapowers, measures, reflection, pcf theory, models of set theory, axioms of set theory, independence, axiom of choice, continuum hypothesis, determinacy, Borel equivalence relations, Boolean-valued models, embeddings, orders, relations, transfinite recursion, set theory as a foundation of mathematics, the philosophy of set theory.
2
votes
1
answer
139
views
Uniquely selecting points from open pairwise disjoint refinements of an open cover
Let $\mathcal U$ be an open cover of some space $X$.
Let $\{\mathcal V_\alpha:\alpha<\kappa\}$ enumerate all of its pairwise-disjoint
open refinements.
When is it possible to define sets $Z_\alpha$ su …
- 933
3
votes
What are the names of the following classes of topological spaces?
For (1), $\omega$ bounded.
I'm unaware of names for the other concepts.
- 933
1
vote
Strategic vs. tactical closure
Edit: leaving this up just in case (and for the comments), but I'm pessimistic that the idea is recoverable - see discussion below.
As JDH observed, there are topological spaces $X$ for which Player I …
- 933