| 单词 | null line |
| 释义 | > as lemmasnull line null line n. (a) Mechanics and Geometry a line about which the moment of a given torque is zero; (b) Physics a line in space–time representing the path of a light ray, on which any two points have zero interval (interval n. 2c). ΚΠ 1849 Cambr. & Dublin Math. Jrnl. 4 163 The sum of all the successive lines, including the closing line, will be a null line, because the motion thus conceived would simpy bring a moving point back to its original or initial position. 1906 Trans. Amer. Math. Soc. 7 395 We shall find it convenient to speak, instead of the linear complex, of the screw for which the lines of the linear complex are null lines. 1928 London, Edinb., & Dublin Philos. Mag. 7th Ser. 5 242 A null-surface is defined as an envelope of null-cones,..while the characteristic lines on a null-surface prove to be geodesic null-lines. 1992 Eng. Today Apr. 60/2 Helicity (possibly from Penrose) ‘could be thought of as the “spin” of a massless object such as a twistor, null line or photon of light’. < as lemmas |
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