Equation Icon  2 √-- [ − 1 2 −1 2 2 2] ds10 = Δ − (H1H2H3 ) fdt + (f dr + r dΩ 3) 1 ∑3 ( ) + √--- Hi L2d μ2i + μ2i[L4dϕi + (H −i1− 1)dt]2 , (420 ) Δ i=1