| 释义 |
disyntheme Math.|daɪˈsɪnθiːm|
[f. di-2 + syntheme.]
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.
1879Sylvester in Amer. Jrnl. Math. II. 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. Ibid., Duadic disyntheme, Any combination of duads, with or without repetition, in which each element occurs twice and no oftener. |