| 单词 | disyntheme | 
| 释义 | disynthemen. Mathematics.   A system of groups of elements, each of the groups being formed of a certain number of elements, so that each occurs just twice among all the groups. Thus 1 · 2, 2 · 3, 3 · 4, 1 · 4 is a duadic disyntheme—that is, one composed of pairs. ΚΠ 1879    J. J. Sylvester in  Amer. Jrnl. Math. 2 94  				When a disyntheme is formed by means of cycles all of an even order, it will be resolvable into a pair of single synthemes, and in no other case. 1879    J. J. Sylvester in  Amer. Jrnl. Math. 2 94  				Duadic disyntheme, Any combination of duads, with or without repetition, in which each element occurs twice and no oftener. This entry has not yet been fully updated (first published 1897; most recently modified version published online June 2018). <  | 
	
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