Oltarus
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 Oct 28 awarded Yearling Sep 12 awarded Nice Question Jul 19 comment Are there an infinite set of sets that only have one element in common with each other? Also: there are some cards that have the same symbol in common. For example: there are 3+ cards with a heart, as shown here: party-games.fr/client/gfx/photos/produit/DOBBLE_PS_778.jpg, which would imply to your calculation that there are points that are on 3+ lines. Jul 19 revised Are there an infinite set of sets that only have one element in common with each other? added 104 characters in body Jul 19 comment Are there an infinite set of sets that only have one element in common with each other? Hehe, I didn't lose any cards, it's the number of cards included in the game, according to the box. That same box also tells me there are 50 symbols altogether, if it helps. Jul 19 revised Are there an infinite set of sets that only have one element in common with each other? Added an example Jul 19 comment Are there an infinite set of sets that only have one element in common with each other? Very interresting, @AndreaMori. If you have a complete explanation, I would love to hear it. Jul 19 comment Are there an infinite set of sets that only have one element in common with each other? Yes, the number of elements altograther is missing. I don't know it. I added an edit: each element appear in the same number of sets. Jul 19 comment Are there an infinite set of sets that only have one element in common with each other? Duh, of course. Sorry, my bad. I edited the question. Your answer is perfectly correct but my question was missing something. Jul 19 revised Are there an infinite set of sets that only have one element in common with each other? Added a requirement Jul 19 revised Are there an infinite set of sets that only have one element in common with each other? added 55 characters in body Jul 19 asked Are there an infinite set of sets that only have one element in common with each other? Jun 27 accepted What is the shortest sequence that contains every permutation of $1..n$? Jun 25 accepted Trick to find multiples mentally Jun 25 accepted What is $\gneq$? Jun 25 asked What is the shortest sequence that contains every permutation of $1..n$? Jun 7 accepted How to prove such a function doesn't exist? Jun 7 comment How to prove such a function doesn't exist? Yeah, wellâ€¦ ahemâ€¦ thanks. Jun 7 asked How to prove such a function doesn't exist? Feb 12 answered Approximation of $e$ using $\pi$ and $\phi$?