查询词典 necessary and sufficient conditions

Necessary and sufficient conditions for convexity preserving of developable surface patches are presented.

文中对计算机辅助设计技术中常用的可展面进行了保凸分析，利用该结论可以轻而易举地判别和控制可展面的形状

First we give some necessary and sufficient conditions for the oscillation of(1) by Lebesguge s dominated convergence theorem and Schauder — Tychonoff fixed point theorem.

这篇文章中，我们首先利用Lebesgue控制收敛定理，以及Schauder-Tychonoff不动点定理给出了方程(1)振动的若干充分必要条件。

We give Some necessary and sufficient conditions on the existance of solutions to partial eigenvalue assignment problem, and discuss some measures of robustness of the closed-loop system.

求解这类问题的困难主要在于： 1。如何给出二次系统的部分极点配置问题的解的参数表达式？

More specifically, it is intended to elicit the necessary and sufficient conditions for such an argument to go through.

更明确的，是要引出执行这种论证的充分和必要条件。

In chapter two, by studying the properties of self-maps on trees, we obtain five necessary and sufficient conditions for the product self-maps on trees which have the property of equicontinuity on their sets of periodic points, i.e.

第二章通过对树上连续自映射性质的研究，给出了树上乘积自映射在其周期点集上等度连续的五个充要条件，即定理2.3.1，定理2.3.2，定理2.3.3和定理2.3.4。

We get the necessary and sufficient conditions about admissibility for linear estimators of estimable function among the inhomogeneous linear class.

利用矩阵的向量化方法，研究了带线性约束的增长曲线模型中可估函数的线性估计在非齐次线性估计类中可容许的充要条件。

In the paper, the criterion of the white exponential law of a discrete function is given after discussing the necessary and sufficient conditions of a continuous function being an exponential function.

研究了函数为指数函数的充要条件，并给出了白指数律的判别准则。

Some necessary and sufficient conditions for a hexagonal systems to be l-resonant were established.

一个有意义的问题是：在什么条件下，六角系统中任意t个不交的六边形是互相共振的？

And finally we obtain the necessary and sufficient conditions for a fuzzy matrix to be idempotent.

得到了Fuzzy群矩阵是幂等矩阵的充分必要条件。

We show several necessary and sufficient conditions for the invertibility of commutator of idempotent and involutory matrices.

研究了复数域上两个n阶幂等矩阵P与Q的换位子PQ-QP的可逆性问题。

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％。