英语词汇“principal normal”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

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principal normal

principal normal n. Geometry the normal drawn to a given point on a curve and located in the plane containing the direction of curvature at that point.

ΚΠ

a1832 Encycl. Metrop. (1845) II. 153 This normal, the direction of which is the limit of the direction of the line of junction, has been designated by the name of the principal normal.

1902 Amer. Jrnl. Math. 24 36 The tangent to the involute, the principal normal to the evolute and the tangent to the spherical indicatrix of the evolutes, are parallel lines.

1999 Proc. Royal Soc. A. 455 3164 Directional derivatives in the tangential, principal normal and binormal directions.

extracted from principaladj.n.adv.

as lemmas

单词	principal normal
释义	> as lemmas principal normal principal normal n. Geometry the normal drawn to a given point on a curve and located in the plane containing the direction of curvature at that point. ΚΠ a1832 Encycl. Metrop. (1845) II. 153 This normal, the direction of which is the limit of the direction of the line of junction, has been designated by the name of the principal normal. 1902 Amer. Jrnl. Math. 24 36 The tangent to the involute, the principal normal to the evolute and the tangent to the spherical indicatrix of the evolutes, are parallel lines. 1999 Proc. Royal Soc. A. 455 3164 Directional derivatives in the tangential, principal normal and binormal directions. extracted from principaladj.n.adv. < as lemmas
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