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Feb
24
awarded  Excavator
Feb
24
revised Chain rule for partial derivatives intuition
the equations are below, not above
Feb
24
suggested approved edit on Chain rule for partial derivatives intuition
Dec
14
comment About semipositive definite matrix
What is semipositive?
Dec
12
comment How do I explain 2 to the power of zero equals 1 to a child
@Newb I'm sure that' a great one to make a child understand ;-)
Nov
5
awarded  Notable Question
Apr
5
comment Is value of $\pi = 4$?
My first programming experience, using turtle graphics, involved drawing a circle: "repeat 360: forward 1, right 1". This messed up my the idea of a circle in my 9-year old mind for years.
Apr
5
comment Has lack of mathematical rigour killed anybody before?
Should this question be on History of Science and Mathematics?
Apr
1
comment Fastest way to meet, without communication, on a sphere?
@JeppeStigNielsen True, seeing 45% of the surface is a good compromise. And you can see the friend more easily than you can see the surface of the sphere. Actually, you can just both fly up until the sphere below you is vanishingly small and then you're almost 100% sure to have a free line of sight to each other. But I suppose the rules require both users to stay at the surface.
Apr
1
comment Fastest way to meet, without communication, on a sphere?
Even better: fly vertically up until you can see half the sphere, then start orbiting. If your friend does the same, you should pass in each others line of sight soon.
Apr
1
revised Fastest way to meet, without communication, on a sphere?
Added rule about no marks, as indicated in the comments.
Apr
1
suggested approved edit on Fastest way to meet, without communication, on a sphere?
Mar
31
awarded  Organizer
Mar
31
revised Fastest way to meet, without communication, on a sphere?
Added tag game-theory
Mar
31
suggested approved edit on Fastest way to meet, without communication, on a sphere?
Mar
31
comment Fastest way to meet, without communication, on a sphere?
Anderson, E. J.; Weber, R. R. (1990), "The rendezvous problem on discrete locations", Journal of Applied Probability 27 (4): 839–851, doi:10.2307/3214827. From the observation that this is a difficult problem with 3 discrete, unstructured locations, I believe this problem is not going to be solved by Math Stack Exchange.
Mar
31
comment Fastest way to meet, without communication, on a sphere?
What would be the optimal distribution? I guess you want some positive correlation between the direction at step $n$ and step $n+1$. Perhaps we can model this analogously to a scattering problem, where scattering is preferentially forward?
Feb
8
comment What was the first bit of mathematics that made you realize that math is beautiful? (For children's book)
We should add an image of this to every interstellar spacecraft we ever launch.
Feb
2
comment My sister absolutely refuses to learn math
This question would be on-topic on Mathematics Educators.
Jan
26
awarded  Popular Question