(Δs)^2 = -(1/√(εμ)Δt)^2 + (Δx)^2 + (Δy)^2 + (Δz)^2 (Δs)^2 = -(1/√(εμ)Δt)^2 + (Δx)^2 + (Δy)^2 + (Δz)^2

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