| 单词 | harmonical numbers |
| 释义 | > as lemmasharmonical numbers a. Mathematics. = harmonic adj. 5 †harmonical numbers: numbers in harmonic progression (obsolete). ΘΚΠ the world > relative properties > number > mathematical number or quantity > numerical arrangement > [adjective] > of sets > of sequences > progression geometrical1543 harmonical1569 progressional1570 musical1589 equidifferent1696 harmonic1706 synharmonic1850 preferred1922 1569 J. Sanford tr. H. C. Agrippa Of Vanitie Artes & Sci. 25 b Of Harmonical Numbers, and Geometrical. 1597 T. Morley Plaine & Easie Introd. Musicke Annot. sig. *3 Harmonical proportion is..when the greatest of three termes is so to the least as the difference of the greatest and middle termes, is to the difference of the middle and least. 1728 E. Chambers Cycl. (at cited word) Harmonical Series, is a Series of many Numbers in continual Harmonical Proportion. 1881 J. Casey Sequel to Euclid 89 The reciprocals of lines in arithmetical progression are in harmonical progression. 1882 C. Smith Conic Sect. (1885) 53 PQ:PS::PR–PQ:PS–PR, so that PQ PR PS are in harmonical proportion. < as lemmas |
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