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This book is a contribution to visual geometry, mainly three-dimensional projective geometry and line geometry. There is no better way to get deeply involved in spatial geometry than in exercising the skills of visual representation by means of synthetic geometry. The synthetic method is a characteristic feature of this presentation.

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Renatus Ziegler, born in Basel 1955. Study of mathematics and theoretical physics at the ETH in Zürich. PhD thesis about geometrical mechanics at the University of Kassel, Germany. Since 2001 research scientist in the Institute Hiscia at the Society for Cancer Research in Arlesheim, Switzerland.

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