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Derivator

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**bcs theroy, just an "easy" algebraic manipulation**

Hi folks,

i'm sitting here for hous and I'm wondering, how one can find formula 3.35' on page 61 in Tinkham's book: http://books.google.de/books?id=k6A...superconductivity&pg=PA61#v=onepage&q&f=false

I think, it should be possible to find this formula just with some algebraic manipulation of

|u|^2 + |v|^2 = 1

and

|v/u| = (E - xi)/|Delta|

However, I can't see how... I'm getting nuts...

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derivator