Equation Icon  1 [ 𝒢f − f ] x′ = − 4x2 − 4x + ---------- --,𝒢-----− 3(1 − Ωm − Ωr) , (12.19 ) 242H6f,𝒢 𝒢 H2 y′ = xy, (12.20 ) ′ Ω m = − (3 + 2x )Ωm, (12.21 ) Ω ′r = − (4 + 2x )Ωr, (12.22 )