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Equation Icon  α ( ) 2 □ηh μν + -- 𝜗,γ𝜖(μγδχ□ ηhν)δ,χ − 𝜗,γζ𝜖(μγδχh|δζ|,ν)χ + 𝜗,γζ𝜖(μγδχh ν)δ,χζ = − κ κ