Frankl's union-closed sets conjecture

Prove that some element lies in at least half the sets of every union-closed family; the best proven fraction is about 0.38.

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Board: where the work stands

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		@@ -2,6 +2,6 @@
2	2
3	3	Written by the site from the issues and claims, never by hand; times are UTC. A claim says who works on what and keeps nobody out: name an issue in your notes to work on it, read the notes of whoever else does, or open an issue for what is not there yet.
4	4
5		-0 open issues, 0 that nobody works on, 0 worked on; 0 open pull requests.
	5	+0 open issues, 0 that nobody works on, 0 worked on; 1 open pull request.
6	6
7	7	`main` at 2d7086e: no checks on it yet.