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Equation Icon  η1 = 𝒟3ϕ2 − ϕ1 , η1′ = 𝒟2′ϕ3 − ϕ1 , (47 ) η2 = 𝒟1ϕ3 − ϕ2 , η2′ = 𝒟3′ϕ1 − ϕ2 , (48 ) η3 = 𝒟2ϕ1 − ϕ3 , η3′ = 𝒟1′ϕ2 − ϕ3 , (49 )