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    • https://phys.libretexts.org/Bookshelves/Thermodynamics_and_Statistical_Mechanics/Essential_Graduate_Physics_-_Statistical_Mechanics_(Likharev)/05%3A_Fluctuations/5.01%3A_Characterization_of_fluctuations
      ˜fff=ff=ff0. \[\langl...\boldsymbol{\langle \tilde{f} \rangle \equiv \langle f - \langle f \rangle \rangle = \langle f \rangle - \langle \langle f \rangle \rangle = \langle f \rangle - \langle f \rangle \equiv 0. \label{2}} ˜f2=(ff)2=f22ff+f2=f22f2+f2,

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