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( Ωm 1 − Ωm − Ω Λ ) H2 = H20 --3-+ -------2----- + Ω Λ (56 ) [ a a ] = H20 Ωm (1 + z)3 + (1 − Ωm − Ω Λ)(1 + z)2 + Ω Λ . (57 )