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Equation Icon  6 6 2 Γ [f ] = − ∑ -∂--[f(w⃗)⟨Δw ⟩] + 1-∑ ---∂----[f(⃗w )⟨Δw Δw ⟩], (44 ) ∂wi i 2 ∂wi ∂wj i j i=1 i,j=1