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Equation Icon  𝜖+ = ˆm ⊗ ˆm − ˆn ⊗ ˆn, × 𝜖 = ˆm ⊗ ˆn + ˆn ⊗ ˆm, 𝜖x = ˆm ⊗ ˆΩ + ˆΩ ⊗ ˆm, y ˆ ˆ 𝜖 = ˆn ⊗ Ω + Ω ⊗ ˆn, 𝜖b = ˆm ⊗ ˆm + nˆ⊗ ˆn, ℓ ˆ ˆ 𝜖 = Ω ⊗ Ω. (55 )