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Equation Icon  ds2 = g dxα dxβ = (g + e2κ2g Ba Bb ) dx ¯μdx ¯ν + 2e κBa g dx¯μ dxb + g dxa dxb. (82 ) αβ ¯μ¯ν ab ¯μ ¯ν ¯μ ab ab