Shape Operator by Jason Merrill

shapeoperator.com

A famous problem in approximation theory is to approximate the function \left|x\right| as accurately as possible on the interval -1 \le x \le 1 , measured by maximum absolute error, using either polynomials or rational functions of fixed degree.

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Sunset Geometry (2016)

2021153 points56 commentscited by 3Math & Algorithms details

Robert Vanderbei has written a beautiful series of articles and talks about a method for finding the radius of the earth based on a single photograph of a sunset over a large, calm lake.