| 释义 |
ˈsubgroup
[sub- 7 b.]
a. A subordinate group; a subdivision of a group.
1845Darwin Voy. Nat. xvii. 379 One species of the sub⁓group Cactornis. 1859― Orig. Spec. iv. 126 Small and broken groups and sub-groups will finally tend to disappear. 1899Allbutt's Syst. Med. viii. 772 The first three classes might be included in one group—Alopecia neurotica, with sub-groups universalis, localis, and circumscripta. 1935Planning II. xli. 6 Utility Services..has been working in three or four sub-groups, one of which dealing with transport has produced the survey contained in broadsheet No. 21. 1961Y. Olsson Syntax Eng. Verb. ii. 30 One sub-group is independent, for its extra-lingual correlation, of the speech-situation in which its terms are employed. 1978K. Hudson Jargon of Professions 10 Changes in the technology of communication have made it far easier for one cultural sub-group to hear the members of another group talking.
b. Math. A series of operations forming part of a larger group. More widely, any group all of whose elements are elements of a larger group.
1887Amer. Jrnl. Math. IX. 51, I use ‘self-conjugate sub-group’ in translating Klein's ‘ausgezeichnete Untergruppe’ and Jordan's ‘groupe permutable.’ 1888Morrice tr. Klein's Lect. Ikosahedron 6 The simplest sub-group..is always that which arises from the repetitions of an individual operation. 1892F. N. Cole tr. Netto's Th. Substit. 41 No two of these α subgroups have any element in common. 1937, etc. [see proper a. 5 c]. 1975I. Stewart Concepts Mod. Math. vii. 104 If I gave you a group of order 615 you would know, without any information about the multiplication table, that its subgroups cannot have any orders other than 1, 3, 5, 15, 41, 123, 205, and 615.
Hence ˈsubgroup v. trans., to divide or classify into subgroups; sub-grouping, a subsidiary grouping or subgroup; the action of dividing or classifying into these.
1922E. Wallace Flying Fifty-Five xi. 67 They also were grouped and sub-grouped and indexed. 1956J. Klein Study of Groups 168 It must be established that these sub-groupings are not thrown up by chance. 1960Amer. Speech XXXV. 216 The two final chapters [of H. M. Hoenigswald, Language Change & Linguistic Reconstruction] deal with..the procedures for the sub⁓grouping of language families. 1977Lancet 1 Jan. 9/1 The i.q. data from this study have been subgrouped according to whether the immersion accident occurred in the hot or the cold months of the year. 1978Language LIV. 468 Dyen concerns himself with three topics: the AN homeland, the subgrouping and external relationships of the AN language, and reconstruction. |