| 释义 |
trigraphy Geom.|ˈtrɪgrəfɪ|
[f. after homography: see tri-.]
A group of three sets of points or lines having a relation analogous to that of homography between two (see homography 1); that branch of geometry which deals with such relations. Hence trigraphic |traɪˈgræfɪk| a., pertaining to trigraphy.
1895J. W. Russell in Proc. Lond. Math. Soc. XXVI. 446 (title) Applications of Trigraphy... Trigraphic ranges... A trigraphy projects into a homographic trigraphy. Ibid. 448 Given the trigraphic relation, to construct the vague points. Ibid. 450 Trigraphic Pencils. Ibid. 452 Trigraphic Properties of a Quadric Surface. |