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Projektive Geometrie. By L. Bieberbach. Pp. vi + 190. Rm. 7.80. 1931. Teubners Mathematische Leitfäden, 30 (Teubner)
Published online by Cambridge University Press: 03 November 2016
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- Copyright © Mathematical Association 1932
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page no 143 note * It is surprising to find a directrix defined as the polar of a real focus. There is no difficulty in crediting an imaginary focus with an equally imaginary directrix.