查询词典 necessary and sufficient conditions

This paper presents the two conditions:Sufficient condition and necessary condition for the links of perspective mapping and projective mapping.

本文给出了射影映射为透视映射的两个充要条件，这两个充要条件与射影变换为对合的充要条件是一致的。

Sufficient and necessary conditions for the solvability of the disturbance decoupling problems are derived, respectively.

3第三章讨论了上述三类奇异系统的干扰解耦问题，分别推导出各类系统干扰解耦问题可解的充分必要条件。

By using the c-supplementation of Sylow 2-subgroup and Sylow 3-subgroup, we obtain two sufficient and necessary conditions for a finite group to be solvable.

利用Sylow 2-子群和Sylow 3-子群的c-可补性得到有限群成为可解的两个充要条件，推广了几个已知的定理。

At the same time, the sufficient and necessary conditions for holding the control system robust stability are analyzed, and the stability criterion in terms of the spectral radius is presented.

分析了控制系统保证鲁棒稳定性的充要条件，给出基于谱半径的稳定判据。

At first, on the basis of the sufficient and necessary optimality conditions, we give a certain algorithm to compute the trust region subproblem; then, we draw out a different scheme for parameter vector in CIM.

在分析子问题最优性条件的基础上，我们给出了锥函数模型信赖域子问题的求解算法；并从数据拟合的角度提出了对锥模型中参数向量的另外一种选择方案。

To this end, we generalize the results and get the sufficient and necessary conditions for the sum of two or countably many Dirichlet forms to be regular or quasi-regular.

为此，我们得到至多可数个Dirichlet型之和的正则性与拟正则性的判别准则。

Sufficient pathogen, susceptible host and favourable environmental conditions,which are necessary to the outbreaking of the plant disease.

一定数量的病原生物、易感病的寄主以及有利的发病条件是任何病原生物引起的植物病害发生的必要条件。

Based on the periodic NURBS, this paper derives the sufficient and necessary conditions of precise representation of conies.

和其它基于矩形控制多边形的同类方法相比，其控制点数最少。

Efficiency of technology and evaluations of the efficiency by evaluators constitute the sufficient and necessary conditions for the formation of technology norm.

技术的高效用性和评价主体对这种效用的评价，共同构成了技术规范形成的充分而且必要的条件。

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％。