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application examples · Changes

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Add Lambert solver example of hypergeometric function authored Dec 30, 2015 by Liam M. Healy's avatar Liam M. Healy
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application-examples.md
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......@@ -6,6 +6,7 @@ Hypergeometric functions
The hypergeometric function 2F1 is used in [Battin's](http://www.worldcat.org/oclc/839826772) method solving the Lambert problem, the two-point boundary value problem for orbital motion. The derivative with respect to the final argument (see [Wolfram](http://functions.wolfram.com/HypergeometricFunctions/Hypergeometric2F1/20/01/05/)) is helpful when solving using Newton's method.
(set-reader-in-file)
(defun hypergeometric-and-derivative (z)
"The hypergeometric function F(3,1;5/2;z), (7.47), and its derivative dF/dz (7.49)."
(declare (optimize (speed 3) (debug 0) (safety 0)))
......
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