Equation Icon  μ− λ v ( x ⋅ v μ−λ ∘ -------) x ∂tf + e ∘-------2-⋅ ∇xf − λt-----+ e μr 1 + |v|2 --⋅ ∇vf = 0, (31 ) 1 + |v| r r e− 2λ(2rλr − 1 ) + 1 = 8πr2 ρ, (32 ) − 2λ 2 e (2rμr + 1 ) − 1 = 8πr p. (33 )