| 释义 |
symmetroid Geom.|ˈsɪmɪtrɔɪd|
[irreg. f. symmetry + -oid.]
Cayley's name for a certain surface of the fourth order: see quot.
1870Cayley Math. Papers VII. 134 The surface which I call a symmetroid; viz., the surface represented by an equation △ = 0, where △ is a symmetrical determinant of the 4th order the several terms whereof are linear functions of the coordinates (x, y, z, w). |