Equation Icon  ΔXm = δXm + δXm + δ Xm = ¯𝜖Γ m𝜃 + am + ωm Xn, (125 ) 𝜖 a ω n Δ 𝜃α = δ𝜃α + δ 𝜃 α = 𝜖α + 1ωmn (Γ 𝜃)α , (126 ) 𝜖 ω 4 mn ΔV μ = δ𝜖V μ, (127 )