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Homework Statement
The actual question was deriving Bose-Einstein, but I got confused on the F-D example. I'm basically following the method given here.
Homework Equations
[All taken directly from the above link]
Taylor series:
The Attempt at a Solution
So after that third equation is where I can't figure it out. To relate Zs(N-1) to Zs(N), we Taylor expand Zs(N-ΔN) to get:
where
Looking specifically at that middle step, I figured the terms after the second term were truncated. I don't understand what is being used as the function, what are x and a, etc. Can someone point me in the right direction?