| 单词 | harmonic proportion |
| 释义 | > as lemmasharmonic proportion harmonic average: = harmonic mean harmonic conjugates: each of the two pairs of points AB, CD, in relation to the other pair, in a straight line ACBD divided harmonically at C and B. harmonic division: division of a line at four points A, C, B, D, such that the lengths AC, AB, AD, are in harmonic proportion; also analogous division of an angle or other magnitude. harmonic pencil: a system of four straight lines in a plane meeting at one point, such as to divide harmonically every straight line that cuts them. harmonic progression: the relation of a series of quantities whose reciprocals are in arithmetical progression, or such a series itself. harmonic proportion: the relation of three quantities in harmonic progression; the second is said to be a harmonic mean between the first and third. harmonic range (also harmonic row): a series of four points in a straight line, forming two pairs of harmonic conjugates. harmonic ratio: = harmonic proportion; harmonic series: = harmonic progression, esp. the series 1 + 1/ 2 + 1/ 3 + 1/ 4 + …extracted from harmonicadj.n.< as lemmas |
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