查询词典 if and only if

We make progess if,and only if,we are prepared to lear from our mistakes.

只有当你准备好从错误中学习的时候，你才会有进步。

It is proved that Poisson-stable points are dense in the locally compact phase space X if and only if non-wandering point s are dense in the X.

证明了如果相空间X局部紧，则Poisson稳定点在X中稠与非游荡点在X中稠等价。

Beginning a conditional-assembly block with the line %ifdef MACRO will assemble the subsequent code if, and only if, a single-line macro called MACRO is defined.

以代码行%ifdef MACRO开头的条件汇编块将汇编接着下来的代码当且仅当叫做MACRO的单行宏被定义的情况下。

In addition, we obtain the following results:(1) A ring R is weakly unit-regular if and only if so is the n×n matrix ring Mn of R for any n≥1;(2) Let R be a ring such that R/J is regular.

另外，我们还证明了下面两个结果：(1)环R是弱幺正则的当且仅当Mn(n≥1)是弱幺正则环；(2)假设R是一个环且使得R/J是正则环。

At the same time, they proved that a multipartite matroid is representable if and only if the corresponding discrete polymatroid is representable.

他们的工作具有令人振奋的结果：通过研究多部拟阵和离散多拟阵之间的关系，他们得到了多部存取结构为理想存取结构的一个必要条件和一个充分条件，并且证明了一个多部拟阵是可表示的当且仅当其对应的离散多拟阵是可表示的。

In this section, we also give a conjecture: A finite lattice is isomorphic to the lattice of flats of a finite poset matroid if and only if it is a semi-modular lattice.

本节的一个中心问题是提出了一个猜想：一个有限格L同构于一个有限偏序集拟阵的闭集所构成的格当且仅当L是一个半模格。

MoH for the test items if and only if there is no LOINC code to represent them.

检验项目，当且仅当LOINC 编码系统中没有相应的代码存在。

It is easy to see that Ohba's conjecture is true if and only if it is true for complete multipartite graphs.

在2002年，Ohba给出如下猜想：每一个顶点个数小于等于2x+1的图G是色可选择的。

Furthermore, it is proved that, under the sufficient condition, the multistep Runge-Kutta method is GP d-stable if and only if it is A-stable.

在文献 [2 ]中，Bellen等考虑了中立型延迟微分方程解析解及单步Runge -Kutta方法的渐近稳定性。

One of the cases was showed in theorem 4.18: finite group G is solvable if and only if Sec is nilpotent for every maximal subgroup At without prime index in G.

在本文中作者将要证明：G可解当且仅当对G中的任意极大子群M，或者I中存在极大元C使C/K幂零并且其Sylow2-子群的幂零类≤2，或者Sec为2-闭。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷