| 释义 |
unicursal, a. and n. Math.|juːnɪˈkɜːsəl|
[f. uni- 1 + L. cursus course: see -al1.]
a. adj. Having, traversing, or being on one course or path.
b. n. A unicursal curve.
1866Cayley in Proc. London Math. Soc. April, A unicursal curve is nothing else than a curve with a deficiency D = 0. 1871― Math. Papers (1895) VIII. 388 On the Transformation of Unicursal Surfaces. 1873G. Salmon Higher Plane Curves ii. 29 If the coordinates can be expressed as rational functions of a parameter the curve has the maximum number of double points. Curves of this sort are called unicursal curves.
Hence unicurˈsality; uniˈcursally adv.
1887Amer. Jrnl. Math. X. 24 In the unicursality-equation a cusp plays the role of an ordinary double-point. 1892W. W. R. Ball Math. Recreat. 124 A figure is described unicursally when the whole of it is traversed in one route. |