| 释义 |
‖ folium|ˈfəʊlɪəm|
[L. folium leaf.]
1. = folio 6.
1886Statem. Land Laws Incorp. Law Soc. 26 Certificates..each constituting a distinct folium consisting of two or more pages.
2. Geom.
a. A finite loop of a nodal curve terminated at both ends by the same node.
b. Folium of Descartes, a plane nodal cubic curve with real nodal tangents, and one real inflexion at infinity.
1848B. Price Diff. Calculus (1852) 319 To determine the nature of the point at the origin of the Folium of Descartes.
c. Used with prefixes uni-, bi-, etc. to indicate a curve with one, two, etc. indentations.
1873Salmon Higher Plane Curves vi. (1879) 221 Zeuthen confines the name oval to a branch having no real bitangent or inflexions, one with a single real bitangent he calls a unifolium, one with 2, 3, or 4 such bitangents, a bifolium, trifolium or quadrifolium. |