单词 | curve of tangents |
释义 | > as lemmascurve of tangents curve of tangents n. Geometry rare †(a) a curve whose ordinates are the tangents of their corresponding abscissae; the graph of the function tan x (obsolete); (b) (in projective geometry) a curve derived from another in such a way that each point corresponds to a tangent line of the original curve in a particular way; the dual (dual adj. and n. Additions) of a curve. ΚΠ 1821 J. Leslie Geom. Anal. iii. xiii. 409 Their vertices will be in what is thence called the Curve of Tangents. 1986 Pacific Jrnl. Math. 124 321 C* ⊂ P2* will denote the dual curve of tangents to C. 2002 A. M. Bonifant & M. Dabija in C. J. Earle et al. Complex Manifolds & Hyberbolic Geom. 18 The dual curve.., defined as the curve of tangents to C, is a sextic. < as lemmas |
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