| 单词 | umbilical focal conic |
| 释义 | > as lemmasumbilical focal conic ΘΚΠ the world > relative properties > number > geometry > curve > [noun] > locus locus1675 evolute1704 place1704 trajectory1795 syntractory1820 focal surface1828 synharmonic1850 syntractrix1852 pedal1862 umbilical focal conic1862 umbilical focal conic1862 stigmatic1863 synchronism1867 synchronous curve1867 Steinerian1873 tac-locus1873 strophoid1880 orthoptic locus1882 strophoidal1908 hypercycle1909 1862 Q. Jrnl. Math. 5 371 Since the umbilici U, V are the points in which the umbilical focal conic cuts the ellipsoid, and the umbilical focal conic is the limit of a confocal hyperboloid, it follows that the umbilici may be regarded as a line of curvature. 1886 P. Frost Solid Geom. (ed. 3) 147 The fixed point is called an umbilical focus..and the locus of the focus the umbilical focal conic. umbilical focal conic † umbilical focal conic n. Obsolete rare a focal conic formed by the umbilics of its associated quadric surface; see focal conic n. at focal adj. Compounds.extracted from umbilicaladj.n.< as lemmas |
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