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## Main Question or Discussion Point

I came upon this page that provides the answer:

http://farside.ph.utexas.edu/teaching/em/lectures/node125.html

But I can't figure out what gamma(u) is. Could anyone help?

http://farside.ph.utexas.edu/teaching/em/lectures/node125.html

But I can't figure out what gamma(u) is. Could anyone help?