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We shall speak of lines and circles as generalized circles. A line is a generalized circle that passes through the point at infinity. Under the inversion 𝜁=1/z the generalized circle (53.3) goes into (53-4) 𝛽|𝜁|²-p𝜁-◌̅p◌̅𝜁+𝛼=0, which is a generalized circle in the ζ-plane.

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