| 释义 |
quadric, a. and n. Math.|ˈkwɒdrɪk|
[ad. L. type *quadric-us, f. quadra square: see -ic.]
A. adj. Of the second degree. (Used in solid geometry, and where the variables are more than two.)
1858A. Cayley Wks. (1889) II. 497 The case of any quadric function of n variables. 1865Athenæum No. 1950. 352/2 Quadric Inversion. 1884A. S. Hart in Hermathena X. 164 Such curves..can be traced on a quadric surface. Ibid. 166 Two of the given equations will represent quadric cones.
B. n. A quantic or surface of the second degree.
1856A. Cayley Wks. (1889) II. 271 The tables Nos. 1 and 2 are the covariants of a binary quadric. 1881Maxwell Electr. & Magn. I. 215 A variable parameter, which we shall distinguish by a suffix for the species of quadric. 1884A. S. Hart in Hermathena X. 164 There are many such [twisted algebraic] curves which do not lie on any quadric. |