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 1d comment Smallest integer $k$ so that no Sudoku grid has exactly $k$ solutions That's impressive! 2d comment Smallest integer $k$ so that no Sudoku grid has exactly $k$ solutions Wow, that is impressive! What if you store sudokus with composite number of solutions as well? It may well be that the smallest non-constructible one is actually composite... Mar 21 accepted Maximal twist in braid group product Mar 20 answered Maximal twist in braid group product Mar 14 reviewed Approve If $f$is continuous on an open interval is the range,$f((a,b))$, an open interval? Mar 14 awarded Promoter Mar 11 comment Maximal twist in braid group product @TobiasKildetoft: Yes, that's what the next sentence says: its enough to show that a left-twist does not increase the maximal right-twist number.. Mar 11 revised Maximal twist in braid group product edited body Mar 11 asked Maximal twist in braid group product Feb 23 comment How do high-achieving students in math study for their exams? It is not about learning the class - it is about really understanding the 5 classes before that is important. Success at the university starts in high-school. Dec 3 comment Expected time to walk in Manhattan @cheesyfluff Well, you need to walk exactly m+k blocks, independent of which path you take, so you can add $(m+k)\times walkingSpeed$ to your final expected time if that feels closer to reality, but it does not change the core of the problem by including/neglecting this walking time. Dec 3 revised Expected time to walk in Manhattan mins -> seconds Dec 3 revised Expected time to walk in Manhattan added 62 characters in body Dec 3 comment Expected time to walk in Manhattan @AkivaWeinberger: Manhattan distance is a precise mathematical notion, also known as taxicab geometry. en.wikipedia.org/wiki/Taxicab_geometry Dec 3 comment Expected time to walk in Manhattan @MarcusM: That's an interesting variation, but then one needs to define how long time it takes to walk a block. Also, in my city, it is not obvious to see how long waiting time there is until it becomes green. Dec 3 revised Expected time to walk in Manhattan added 494 characters in body Dec 3 comment Expected time to walk in Manhattan This is just a question I was thinking about when walking home. It is not homework. I have not worked out the details, but I find it quite beautiful, so I want to share it. Dec 3 asked Expected time to walk in Manhattan Nov 25 awarded Good Answer Nov 5 awarded Good Answer