No CrossRef data available.
Published online by Cambridge University Press: 20 January 2009
§1. The coordinates considered are linear, i.e. in a plane the equation of a straight line, and in space the equation of a plane, is linear in the coordinates. We shall first consider point-coordinates in plane geometry, taking elliptic geometry as typical, with space-constant unity.
1 See, for example, Castelnuovo: Lezioni di geometria analitica (6th ed. 1924), p. 229;Google Scholar or the author's Geometry of n dimensions (Methuen, 1929), p. 55.Google Scholar