Equation Icon  √ ----- x ≡ mr , σ(x) ≡ 4π Gϕ (0,r), Ω ≡ ω ∕m2 , ¯μ ≡ (4 πG ∕m2 )μ , ¯p ≡ (4π G∕m2 )p . (76 )