Equation Icon  μ ( )[ ν ∫ τ− ( ) ] m Du---= f μext + q2 δμν + uμu ν -1--Df-ext-+ 1-Rνλu λ + ∇ νG+ z(τ),z(τ ′) dτ′ (17.51 ) dτ 3m dτ 6 −∞