definition found in the solution to certain wave functions, most
notably the eigenfunctions of angular momentum operators.
-http://en.wikipedia.org/wiki/Spherical_harmonics#Visualization_of_the_spherical_harmonics
+https://en.wikipedia.org/wiki/Spherical_harmonics#Visualization_of_the_spherical_harmonics
Written by Paul Bourke and Jamie Zawinski; 2002.
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