gerrit
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 Apr5 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. Apr5 comment Has lack of mathematical rigour killed anybody before? Should this question be on History of Science and Mathematics? Apr1 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. Apr1 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. Apr1 revised Fastest way to meet, without communication, on a sphere? Added rule about no marks, as indicated in the comments. Apr1 suggested approved edit on Fastest way to meet, without communication, on a sphere? Mar31 awarded Organizer Mar31 revised Fastest way to meet, without communication, on a sphere? Added tag game-theory Mar31 suggested approved edit on Fastest way to meet, without communication, on a sphere? Mar31 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. Mar31 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? Feb8 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. Feb2 comment My sister absolutely refuses to learn math This question would be on-topic on Mathematics Educators. Jan26 awarded Popular Question Sep24 awarded Autobiographer Sep24 comment Can a number have infinitely many digits before the decimal point? Is it not possible to have a sequence with an infinite number of elements, but where the beginning and ending are known? And then define a number as all the numbers in this sequence concatenated in some prescribed base... Sep24 comment Can a number have infinitely many digits before the decimal point? you don't, because the information relies in the "first" digit. Of course nobody know what the first digit is, since there is no first digit.. What if I have $123......321.123$ and $234......432.234$? The second number is larger...? Jul27 comment Is every factorial divisible by its sum of digits? How about $0$ ? May17 comment Should I understand a theorem's proof before using the theorem? You can easily lose weeks of time reading books and papers... Actually, you could lose years. Apr14 awarded Critic