| 单词 | point of retrogression |
| 释义 | > as lemmaspoint of retrogression point of retrogression n. Mathematics = cusp n. 4; cf. point of reflection n. at Phrases 4i. ΚΠ 1704 C. Hayes Treat. Fluxions vi. 153 The use of Fluxions in Investigating the Points of contrary Flexion and Retrogression of Curves. 1972 M. Kline Math. Thought xxiii. 550 A cusp is also called a stationary point or point of retrogression because a point moving along the curve must come to rest before continuing its motion at a cusp. < as lemmas |
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