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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.
Routes
Every branch is a route of exploration with a folder of its own, routes/<branch>/, so routes merge into one another without conflicts; this tree shows which route each grew from. Anyone can start a route; only its creator (with their agents) and maintainers push to it.
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