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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
Oct
13
reviewed Approve How do I find the altitude, base and the length of a triangle?
Oct
13
reviewed Approve Charpit's Method
Sep
29
awarded  Custodian
Sep
29
comment What are some things we can prove they must exist, but have no idea what they are?
You mean approximated, I guess?
Sep
27
answered What are some things we can prove they must exist, but have no idea what they are?
Sep
14
comment If $ \frac{1}{2}A + \frac{1}{2}A \subset A $, and $A$ is closed, then $A$ is a convex set
Note that we really need a closed set $A$, otherwise, the set where all coordinates are rational numbers would satisfy said relation but is not convex.
Sep
13
comment Can someone explain the reasoning behind Cantor's diagonal argument?
How about asking your professor or at math.stackexchange? This is not really research-level mathematics...
Aug
28
comment Smallest integer $k$ so that no Sudoku grid has exactly $k$ solutions
according to wikipedia, the blank sudoku allows 6,670,903,752,021,072,936,960 number of solutions, so the number we seek is less than that :P. Also, I guess this implies that there is no sudoku that admits exactly 6,670,903,752,021,072,936,959 solutions :D
Aug
28
comment Smallest integer $k$ so that no Sudoku grid has exactly $k$ solutions
@Mauris: Sure, i added it now. its pretty basic, but less complicated means fewer bugs usually.
Aug
28
revised Smallest integer $k$ so that no Sudoku grid has exactly $k$ solutions
added 1396 characters in body