| 释义 |
evolvent, a. and n. Math.|ɪˈvɒlvənt|
[ad. L. ēvolvent-em, pr. pple. f. ēvolvĕre: see evolve.]
A. adj. That evolves. † evolvent line: the right line (the tangent to the evolute), the extremity of which is the locus of the involute.
B. n.
1. The involute of a curve.
2. (See quot. 1862.)
1708tr. Gregory's Prop. Catenaria in Misc. Cur. II. 236 The Evoluent Line UF is a third Proportional to AC and CB. 1727–51Chambers Cycl., Evolvent, in geometry..the curve resulting from the evolution of a curve; in contradistinction to the evolute. 1796in Hutton Math. Dict. 1862F. Hall Hindu Philos. Syst. Introd. 9 note, ‘Originant’ might answer, or ‘evolvent’ [for prakṛiti]; and ‘originate’ or ‘evolute’ for vikṛiti. 1882E. B. Cowell in tr. Sarva-darśana-saṃgraha 221 That which is evolvent only [note, I borrow this term from Dr. Hall.]. |