dichotomy
n. 两分, 分裂, 二分法 [医] 二分(二分之一); 二叉, 二歧
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词形变化
教材释义与例句
二分法；两分；分裂；双歧分枝
释义与例句
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1.
A separation or division into two; a distinction that results in such a division.
二分法
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2.
Such a division involving apparently incompatible or opposite principles; a duality.
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3.
The division of a class into two disjoint subclasses that are together comprehensive, as the division of human into female and male.
可数 不可数 数学 哲学2011, Tomasz A. Gorarzd, Jacek Krzaczkowski, The Complexity of Problems Connected with Two-Element Algebras, Paweł M. Idziak, Andrzej Wronski, Reports on Mathematical Logic: No. 46, page 92, One can ask if for any algebra the considered problem is always in P or NP-complete (P or coNP-complete)? For example, the problem of the satisfiability of a system of polynomial equations over a group G is in P if G is abelian and NP-complete otherwise ([7, 13]). One of the most widely known subclasses of NP which exhibits such a dichotomy, is the class of constraint satisfaction problems (CSP) on the set {0,1}, see [16]. Recently Bulatov proved the dichotomy for CSP on a three-element set [3].
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4.
The division of a genus into two species; a division into two subordinate parts.
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5.
A phase of the moon when it appears half lit and half dark, for example at the quadratures.
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6.
Division and subdivision; bifurcation, such as that of a stem of a plant or a vein of the body into two parts as it proceeds from its origin; often successive.
可数 不可数 生物 植物学1969, J. F. Rigby, Permian Sphenopsids from Antarctica, Geological Survey Professional Paper 613-F, page F-9, In one forked leaf there is a distinct vein dichotomy, and the leaf boundary commences 1.5 mm above the dichotomy.
词汇关系
同义词 1
上位词 3
相关短语
词源
From Ancient Greek διχοτομία (dikhotomía, “dichotomy”).
来源：wiktionary