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 Nov 22 awarded Benefactor Nov 22 comment Counting number of mathematical objects and structures Thanks a lot, @MickG! It seems not restricting the problems to finite sets was a main problem :) Nov 22 accepted Counting number of mathematical objects and structures Nov 22 comment Counting number of mathematical objects and structures @JoãoRocha Thank you :) You're right with the sign of the Stirling numbers, of course. In my definition, they are always positive. It really seems that definitions and notations are not consistent for the Stirling numbers. Nov 20 comment Number of permutations for card decks in “Skat” and “Doppelkopf” games @HennoBrandsma Thanks for explaining these! Obviously, your solution is the correct one :) Nov 20 comment Number of permutations for card decks in “Skat” and “Doppelkopf” games @HennoBrandsma Thank you! I guess your calculation does not pay attention to the order (which makes sense with cards on one's hand). Is my own calculation at least correct for the case where the order is crucial? Nov 20 revised Number of permutations for card decks in “Skat” and “Doppelkopf” games added 27 characters in body Nov 20 asked Number of permutations for card decks in “Skat” and “Doppelkopf” games Nov 15 awarded Promoter Nov 12 asked Counting number of mathematical objects and structures Dec 4 accepted Sole minimal element: Why not also the minimum? Dec 2 awarded Yearling Dec 2 awarded Nice Question Dec 2 awarded Commentator Dec 2 comment Sole minimal element: Why not also the minimum? Do I even need the $c$ as a non-comparable element then? I mean, if we don't have a minimum in infinite sets like $\mathbb{Z}$, this is the sufficient condition for the statement being wrong, isn't it? Dec 2 comment Sole minimal element: Why not also the minimum? Thanks! Are infinite descending chains and non-comparable elements the only exceptions that prevent every subset from having a minimal element? Dec 2 comment Sole minimal element: Why not also the minimum? Thank you! So an element that is not comparable (in any direction) is one example where the statement is proved wrong? How is $c$ minimal, however? Dec 2 comment Sole minimal element: Why not also the minimum? Thanks! Is this to shown an infinite descending chain? Dec 2 revised Sole minimal element: Why not also the minimum? deleted 3 characters in body Dec 2 asked Sole minimal element: Why not also the minimum?