Tag Archives: math

A Trick for Computing the Sum of Geometric Series

Say if I need to compute the sum of a series like this one: (1)   where . This series looks like a geometric series in which case the sum can be computed from     The coefficients vary, so … Continue reading

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Half-Light Radii for Various Profiles

For a radial profile of , the enclosed flux within the radius is given by     I’m only concerned about azimuthal symmetric cases, so .  The idea is to solve     for . Gaussian Profile Say the Gaussian … Continue reading

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