设有两个命题p和q,如果由p作为条件能使得结论q成立,则称p是q的充分条件;若由q能使p成立则称p是q的必要条件;如果p与q能互推(即无论是由q推出p还是p推出q都成立),则称p是q的充分必要条件,简称充要条件,也称p与q等价。
n. equivalence
misc. of equal value ; equal in value
上述定义中的非(negation)、合取(conjunction)、析取(disjunction)、蕴涵(implication) 和等价(equivalence)是在命题逻辑中的术语,而引号中给出的复合命题是自然语言中的典型 用法。
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等价物 equivalent ; [物价] Equivalent ; TEQs ; object of equivalent value
逻辑等价 [数] logical equivalence ; Eqv
等价形式 equivalent form ; equivalent form of value
等价交换 exchange of equivalents; equivalent exchange
一般等价物 general equivalence; general/universal equivalent ; universal equivalent ; [贸易] unity equivalent
价值等价物 equivalent; value equivalent; equivalent for value
等价类 [数] equivalence class ; aequivalenzklasse equivalence class
等价交换原则 principle of the exchange of equivalents
李嘉图等价定理 Ricardian equivalence proposition; Ricardo–de Viti–Barro equivalence theorem ; the Ricardian Equivalence Theorem ; Ricardo Equivalence Theorem ; Ricardian equivalence
is a R-function equivalence class.
的函数集是一个R-函数等价类。
参考来源 - 粗决策规律与粗规律挖掘Homeomorphic morphism and homotopy equivalence are two important concepts in the theory of algebraic topology.
同胚映射和同伦等价是代数拓扑学中的两个重要概念。
参考来源 - 关于同伦正则态射及其应用·2,447,543篇论文数据,部分数据来源于NoteExpress
所有工作都有同等价值,所以我们不能歧视体力劳动者。
All work is of equal value, so we can't look down upon those manual workers.
为何要和那些懒得为你献上玫瑰与钻石可疑的等价物的二等男友配对呢?
Why mate with a second-class beau who cannot be bothered to bring you the fishy equivalent of roses and diamonds?
然而这不是一种便宜的购物方式,因为主人会非常得体地期待你送他一份同等价值、同样漂亮的礼物作为回赠。
This is not a cheap way to do your shopping, however, as your host will, quite correctly, expect you to respond by presenting him with a gift of equal worth and beauty.
So we can think about now doing bonding, and now we have four equal orbitals with one electronic each.
我们现在可以考虑成键了,现在我们有4个等价的轨道,每个上面有1个电子。
Well, if this bond has completely identically equal sharing of electrons, then this bond will be nonpolar.
如果一根键连的两个原子,对键上的电子吸引程度是完全等价的,那么这根键是非极性的。
But if I want to do it all in one shot, what is the equivalent step I should take?
但我如果想要一步完成,那我应该用什么样的等价步骤呢
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