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seen Mar 17 '11 at 16:10

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comment What is the probability that 4 points determine a hemisphere ?
An equivalent problem is a Putnam problem phrased as "Four points are chosen at random on the surface of a sphere. What is the probability that the center of the sphere lies inside the tetrahedron whose vertices are at the four points". Solutions are written in detail here: books.google.com/…;
Jul
5
comment What are some reasonable-sounding statements that are independent of ZFC?
Speaking of stuff on the plane, a certain problem of coloring the plane with no corners is equivalent to CH too - artofproblemsolving.com/Forum/viewtopic.php?f=73&t=137999
Jun
15
comment Examples of common false beliefs in mathematics
A related thread: mathoverflow.net/questions/7998/…
Jun
15
comment Examples of common false beliefs in mathematics
AB and BA share the same invertible part : artofproblemsolving.com/Forum/viewtopic.php?f=349&t=112209
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7
awarded  Commentator
Jan
7
comment Famous mathematical quotes
like blue collar versus cubicle
Jan
7
comment Famous mathematical quotes
like physics versus mathematics
Jan
7
comment What is the probability that 4 points determine a hemisphere ?
Related thread: mathoverflow.net/questions/2014/…
Dec
24
comment Probabilistic Proofs of Analytic Facts
I realize this isn't an analytic fact
Dec
24
answered Probabilistic Proofs of Analytic Facts
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awarded  Editor
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8
accepted most general way to generate pairwise independent random variables?
Dec
8
revised most general way to generate pairwise independent random variables?
second example typo