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Fabius Wiesner's user avatar
Fabius Wiesner's user avatar
Fabius Wiesner
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revised
Minimum number of sets for a union-closed sets conjecture counterexample
added 112 characters in body
asked
Minimum number of sets for a union-closed sets conjecture counterexample
accepted
Number of disjoint set triplets in a union-closed family
comment
Number of disjoint set triplets in a union-closed family
Is $239$ just to pick a big number? In other words, might it work with a smaller order for $K$?
comment
Number of disjoint set triplets in a union-closed family
At most. It is the dual of the linked question.
revised
Number of disjoint set triplets in a union-closed family
added 238 characters in body
asked
Number of disjoint set triplets in a union-closed family
asked
Searching another example related to the union-closed sets conjecture
revised
Looking for another difficult case for the union-closed sets conjecture
edited body
revised
Conjecture about commutative semigroups
deleted 54 characters in body
revised
Conjecture about commutative semigroups
added 13 characters in body
revised
Conjecture about commutative semigroups
added 427 characters in body
comment
Conjecture about commutative semigroups
For $n=3$ there is the counterexample $\mathbb{Z}/3\mathbb{Z}$.
comment
Conjecture about commutative semigroups
@BenjaminSteinberg now the question has been heavily edited and should be crystal clear.
revised
Conjecture about commutative semigroups
added 12 characters in body
revised
A slight strengthening of the union-closed sets conjecture
Some minor fix
revised
A slight strengthening of the union-closed sets conjecture
As showed in a comment, the two conjectures were equivalent, therefore I have simplified into a single conjecture.
comment
"Center" of a set of binary strings
This is among "Consensus String Problems", although here we don't want to get a specific $s$ from a given input set of strings, but only to know whether it always exists.
asked
Conjecture about commutative semigroups
revised
A slight strengthening of the union-closed sets conjecture
deleted 8 characters in body
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