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 infinite-combinatorics
Search options not deleted
user 22840
Combinatorial properties of infinite sets. This is a corner-point of set theory and combinatorics.
6
votes
Is it known whether every $\omega$-tree with an infinite antichain has an infinite chain in ...
As shown in the OP, if every countable collection of non-empty finite sets has a choice function, then any countable union of finite sets is countable.
Suppose that the countable union of finite sets …
- 503
11
votes
1
answer
798
views
Is it known whether every $\omega$-tree with an infinite antichain has an infinite chain in ...
In this paper by Good and Tree, the following result is mentioned without proof as part of Proposition 6.5:
Each of the following statements imply those beneath it.
The countable union of finite set …
- 503