查询词典 necessary condition

Based on that, a sufficient and necessary condition of diagnosability for invalidation fault is given.

基于此，给出了失效故障的可诊断性的充分必要条件。

And a sufficient and necessary condition of existence of place invariant for a class of Petri net is proved .

本文以Petri网作为离散事件系统的模型，对控制理论与方法进行了较深入的研究。

In terms of the invertibility of symmetric systems, a sufficient and necessary condition is set up directly on the original systems which avoids using the quotient systems and is some easier than those up to now.

对于对称系统的可逆性问题，还避开了商系统，直接在原系统上建立起一个充要条件，这个条件比现有的可逆性条件要简单。

The correlation between the degree of the polynomial and its irreducible factors is analyzed, and then a sufficient and necessary condition on judging whether a polynomial of arbitrary degree n over finite fields is irreducible or not is presented.

分析了多项式次数与其不可约因式之间的内在联系，给出了有限域上任意n次多项式是否为不可约多项式、本原多项式的一个充要条件。

Tragedy could,it is true,be called pessimistic in its view of the evil in the universe as unremitting and irremediable,but the blight man was born for,the necessary condition of existence.

的确，悲剧可以被认为是悲观的，其原因在于它始终视世间的邪恶为永不止息和无法救赎的。然而那些悲剧人物却是人类存在之必然疾患的证明。

A sufficient and necessary condition of an isothermal surface being a minimal surface is obtained.

除平面外没有其它二次多项式极小曲面，Enneper曲面是目前微分几何文献中唯一出现的三次参数多项式极小曲面，还没有出现高次多项式极小曲面的例子。

Fri particular, the Wittmann-type strong law of larg numbers for independent random variables is generalized to the case of NA random variables. We also present the sufficient and necessary condition of the laws of logarithm, and we extend Teicher-type strong law of the large numbers for sequence of NA random variables. Some of the laws of iterated logarithm of Teicher-type, Egorov-type arid Wittmann-type for sequence of NA random variables are obtained. Then we investigate the rate3f ionvergcll( fbr series of NA randonl variables, we obtain soIne results fbr tl1e Iaws of theiterated logarithttl, the laws of logarithm and decreasing order fOr the tail sum.Risk itllttlysis tlleory is a sigIlifica11t part of insurance InatheInatics.

Wittmann（1985a）关于实独立随机变量列的结果，并给出了NA列强大数律成立的若干条件，特别建立了一般NA列对数律成立的充分必要条件，在二阶矩存在的条件下完整的解决了一般NA列对数律的问题，中文摘要2而已有的一些NA列对数律的结果可以由它推出，给出了NA列的Teiclier型强大数律，表明lbiChCI·（1979）给出的实独立随机变量列的强大数律可以减弱其条件等；建立厂不问分布NA列的Teicfl仪；Egorov，Petrov型有界重对数律，以及加权同分布NA列的有界重对数律，进一步推广了NA列的Kolmogory有界重对数律等，特别对NA列建立了Wittm洲型有界重对数律，而其证明方法与独立情形有很大不同，同时通过反例表明在与独立场合类似的条件下，独立列的Wittmann有界重对数律不能完美的推广到NA歹小惰形；最后研究了NA随机变量级数的收敛速度，给出了尾和下降的阶；尾和的有界重对数律，及尾和对数律成立的充要条件等，并通过反例说明 NA随机变量级数与独立随机变量级数在收敛速度方面存在的差异。

At first, we present a necessary condition for the existence of optimal linear state feedback control by means of Lagrange multiplier theorem.

首先利用Lagrange multiplier定理得到了存在最优线性状态反馈解的必要条件，而在加强的条件下也得到了最优控制存在的充分条件。

The lemma is ready for proving the sufficientand necessary condition. We find that ?

引理是为证明直觉模糊关系方程相容的充要条件而准备的。

At last, for a kind of nonlinear optimal control problems in which the Lie algebra of the system is either 1 or 2 nilpotent, a necessary condition which the optimal control law must satisfied is given.

我们给出了非线性系统可反馈对称化的一个充要条件，并给出了反馈律的构造方法。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。