An introductory account of certain modern ideas and methods in plane analytical geometry (1894)
Scott, Charlotte Angas, b. 1858 · London, New York : Macmillan and Co. · leaf 241
the eo- 226 THEORY OF CORRESPONDENCE. incidence of consecutive points, while a node is produced bythe coincidence of non-consecutive points (Fig-. .54 (a)). … The coincidence of Z, Z may however be brought aboutwithout contact with IJ, by means of a node or cusp at Z.A node is caused simply by the crossing of two ordinarybranches at Z, and the inverse therefore exhibits the contactof two ordinary branches at 0; it has a tacnode, in whichthe two branches…
Geometry, Analytic -- Plane
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