If and only if

Please note : This file is generated if and only if the project is built .

请注意：该文件当且仅当项目构建时生成。

If and only if the four intentional states exist at the same time , the teaching is satisfied .

当且仅当这四个意向状态同时存在，教师之教才得到满足。

Within the US , towns have become star , up hubs if and only if they have both rich people and nerds .

在美国，只有既有富人又有书呆子时，城镇才能成为明星、城市的中心。

The new plan seems to make sense if and only if the principal problem is illiquidity .

只有当首要问题是缺乏流动性的时候，新的计划才似乎有意义。

The crisis will be over if and only if weaker countries regain competitiveness .

如果且只有实力较弱的国家恢复竞争力，这场危机才会结束。

If and only if you are interested please give us you lowest offer of stearic acid ?

当且仅当你有兴趣，请你最低硬脂酸提供给我们？

If and only if the defense cost is much too high , the opportunist will dominate the system .

若防范成本过大，则机会主义者将主宰系统。

The results are three if and only if conditions under which an optimal schedule is of interval perturbation robustness .

本文的结果是该问题在加工时间扰动下最优调度具有区间摄动鲁棒性的三个充分必要条件。

Is quotient group of G if and only if the following conditions are satisfied : ( I ) ?

A是G的商群的充要条件是：（ⅰ）（？）

H ( X , Y ) is complete if and only if the space Y is Banach space .

证明了有界齐性算子空间H（X，Y）为Banach空间当且仅当空间Y是完备的。

An epistemic proposition is true if and only if it is a member of corresponding world .

一个认知命题是真的，当且仅当它属于相应的认知世界之中。

To see this yourself , design a small test program that will compile if and only if the desired condition is true .

为了能切身体会，您可以设计一个小测试程序，这个程序当且仅当期望的条件得到满足时才可以编译。

Thus , R is : commutative if and only if N is commutative .

（1-）环的直接和。于是，R是交换的，当且仅当N是交换的。

Some judgement is in a block if and only if the sets of optimal strategies under them are equal ;

2两个判断下的最优策略集相等的充要条件是这两个判断位于同一个判断块中；

Two sets are said to be equivalent if and only if they can be placed in one-to-one correspondence .

当且仅当两个集合中的元素一一对应时，才称它们为等势。

In other words , this method returns true if and only if the Role is allowed all privileges on the Resource .

相反地，当且仅当角色在此资源上的所有权限都被允许时，返回TRUE。

Playing games is such a good method to have fun , if and only if you can handle the game in healthy way .

游戏是获得快乐的一种很好的途径，但如果与这渐行渐远获得的会是伤痛。

Positive semi-definite matrices are positive definite if and only if they are nonsingular .

正半定矩阵是正定的，当且仅当它们是非奇异矩阵。

They cross at symmetric matrix , two symmetric matrices are congruent if and only if they are similar .

对称矩阵是这两个知识点的交汇点，即两个实对称矩阵合同当且仅当它们相似。

A good deductive argument is sound if and only if it 's both valid and has true premises .

一个好的演绎论点是完好的，如果且仅如果这些都有效，并且前提为真。

It is proved that a function is Riemann integrable if and only if it is continuous almost everywhere .

证明了函数可积的充要条件是该函数几乎处处连续。

It also proves that a congruence on X ~ + is perfect if and only if the quotient is free .

证明了完全同余关系的特征性质：商半群是自由半群。

The result shows that although environmental resource is generally optimized under cooperation , cooperation will occur if and only if the technical difference is limited .

结果表明，尽管双方合作使得环境资源得以整体优化，但只有技术差异在一定程度内双方才愿意进行合作。

( For example : An existential sentence is true on some finite field if and only if it is true on some field . )

（例如：一个存在语句能在一有限域上成立当且只当它能在一域上成立。）

We show that a p-semisimple BCI-algebra is simple if and only if its order is prime .

证明了一个p－半单BCI－代数是单的当且仅当它的阶是素数；

The Boolean operation whose result has the Boolean value 0 if and only if each operand has the Boolean value 0 .

一种布尔运算，当且仅当每个操作数都具有布尔值0时，其结果才具有布尔值0。

First , we show that an online reverse auction is incentive compatible if and only if the auction is based on a demand curve .

首先，证明了基于采购商需求曲线的在线反向拍卖是激励相容在线反向拍卖的充分必要条件。

Moreover , Lipschitz connected metric spaces have the contraction property if and only if it is Lipschitz complete .

进一步给出在Lipschitz连通的度量空间具有压缩性质的充分必要条件是空间具有Lipschitz完备性。

Also , we define rational fuzzy sets . We prove that a fuzzy set is equational if and only if it is rational .

同时，还定义了有理模糊集，证明了一个模糊集为等式模糊集当且仅当其为有理模糊集。

The principal can get the maximum profit by leasing the firm , if and only if the agent is risk-neutral .

有且只有经理是风险中性时，所有者可以通过出租企业得到最大的利润。