| 单词 | natural logarithm |
| 释义 | > as lemmasnatural logarithm natural logarithm n. [after post-classical Latin logarithmus naturalis (P. Mengoli Geometriæ Speciosæ Elementa (1659) v. 201); compare French logarithme naturel (1765)] Mathematics a logarithm to the base e (2.71828…); also called hyperbolic logarithm, Napierian logarithm. ΚΠ 1746 A. de Moivre in Philos. Trans. (Royal Soc.) 43 70 The quantity that is here called α, is that which some call the hyperbolic logarithm; others, the natural logarithm. 1816 tr. S. F. Lacroix Elem. Treat. Differential & Integral Calculus 26 These logarithms were known under the very improper name of natural or hyperbolic logarithms. 1943 Gloss. Terms Telecommunications (B.S.I.) 7 Propagation coefficient, propagation constant, the natural logarithm of the vector ratio of the steady-state amplitudes of a wave at a specified frequency. 1953 R. A. Heinlein Starman Jones vii. 85 Max counted ten, then just to be sure, recalled the first dozen 7-place natural logarithms. 1991 G. H. Tomlinson Electr. Networks & Filters 82 The convention is to use a logarithmic unit, namely the neper, which is based on natural logarithms, or the decibel (dB) derived from logarithms to the base 10. < as lemmas |
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