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Equation Icon  [η1′ + 𝒟2 ′η3′ + 𝒟1′𝒟2 ′η2′] = [𝒟2 ′𝒟1 ′𝒟3 ′ − I ]ϕ1 (61 ) [η + 𝒟 η + 𝒟 𝒟 η ] = [𝒟 𝒟 𝒟 − I]ϕ . (62 ) 1 3 2 1 3 2 3 1 2 1