| 单词 | tangential of a point |
| 释义 | > as lemmastangential of a point Geometry. tangential of a point (in a curve of the third or higher order), the point at which a tangent at the given point meets the curve again. ΘΚΠ the world > relative properties > number > geometry > point > [noun] > of intersection or contact > of specific lines or curves cuspis1646 focus1656 point of reflection1674 umbilicus1704 cuspid1743 cusp1758 rhamphoid1814 biplanar1849 oscnode1852 tacnode1852 tangential of a point1858 cnicnode1869 uniplane1869 unode1869 1858 A. Cayley Coll. Math. Papers II. 558 A derivative which may be termed the ‘tangential’ of a cubic, viz. the tangent at the point (x,y,z) of the cubic curve (*)(x,y,z)3 = 0 meets the curve in a point (ξ, η, ζ), which is the tangential of the first-mentioned point. 1859 A. Cayley Coll. Math. Papers IV. 188. 1873 G. Salmon Treat. Higher Plane Curves (ed. 2) v. 127 The point c, in which the tangent at any point a meets the curve again is called the tangential of the point a. < as lemmas |
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