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Gegenbauer functions and applications (esp. circular envelope special case)?
Playing around for a solver for orthogonal polynomials in differential equations I stumbled upon the Gegenbauer polynomials described on Wikipedia the other day.
They are the family of polynomials $y(...
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Solving Kepler's second law
Kepler's second law, about equal areas in equal times, is a differential equation: it gives velocity as a function of location.
Where are the best expository accounts of the process of solving this ...
