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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