Greg Egan
gregeganSF
[1/2] I tweeted recently about Cantor’s famous polynomial bijection from all pairs of non-negative integers to the set of all non-negative integers.Now, it’s easy to find bijections from the pairs
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Mathematica: Here, let me introduce you to the Lerch phi function!Me: I do not wish to know that.Mathematica: But, but … this is part of the thing you’ve been trying
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[1/2] It’s well known that an ellipse will reflect any straight line trajectory from one focus so it passes through the other focus, but what about the parabolic trajectories of
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No individual colour making up this wave travels faster than the grid lines, but the sum of all components appears to outrace the grid. This is how “group velocities” can
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