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Homogeneous Line Coordinates

Published online by Cambridge University Press:  03 November 2016

M. A. Porter
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Extract

p, q, r are lengths of perpendiculars from A, B, C on line, and have same or opposite signs according as A, B, C are on same or opposite sides of the line.

Type
Research Article
Information
The Mathematical Gazette , Volume 14 , Issue 198 , January 1929 , pp. 292 - 295
Copyright
Copyright © Mathematical Association 1929

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References

page 292 note * Cf. C. A. Scott, Modern Analytical Geometry, p. 16.

page 295 note * The book referred to is Pratique de la Géométrie sur le papier et sur le terrain, par Sebastien Leclerc, Paris, 1669. It is the subject of an article by J. H. Graf in Abhandlungen zur Geschichte der Mathematik, Heft 9,1899, pp. 115-22. There were many later editions Paris, 1682, 1700, 1716,1735,1744; translated into Latin, Amsterdam, 1692; into English, under the title Magnum in Parvo: or, the Practice of Geometry, by Robert Pricke, London, 1672 (no mention of Leclerc), later editions, with attribution to Leclerc, 1727 1742; Italian translation, Rome 1761. [Per F. Puryer White.]