In the derivation of the Fluctuation-Dissipation theorem. We encounter an identity
⟨δA(t)δB(0)⟩=⟨A(t)B(0)⟩−⟨A⟩⟨B⟩
where δA(t)=A(t)−⟨A⟩
and δB(t)=B(t)−⟨B⟩
⟨⋅⟩ denotes ensemble average.
How is this derived?
What is stagnation point in fluid mechanics. At the open end of the pitot tube the velocity of the fluid becomes zero.But that should result...
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