查询词典 difficult problem

Equivalently, it can be raised as follows: for an A operator T, if M and N are two invariant subspaces of T satisfying N include M and dimN/M=∞, then does there exist another invariant subspace L such that N include L, and L include M ? It is rather difficult to study the invariant subspace problem of general diagonal operators.

研究表明它可以约化为对角算子的不变子空间的情形，具体地它有如下的等价提法：对于A算子算T，，如果M和N是T的两个不变子空间，满足且dimN/M=∞，那么是否存在T的另一个不变子空间L使得M包含于L，且L包含于N？

Inverse problem is difficult to be solved in scientific research.

反问题一直是科学研究中难以解决的重要问题，在航天、核物理、冶金等领域有着广泛的应用背景。

Sharp boundary inversion is a relatively difficult problem in magnetotelluric and other geophysical inversion, which has been studied by many researchers.

尖锐边界反演是大地电磁及其他地球物理反演中的一个较难解决的问题，目前有不少专家正对这方面进行研究。

Geophysical inversion is a very difficult problem due to its non_linear nature.

由于非线性特性地球物理反演一直以来都是一个比较困难的问题。

To solve this technology difficult problem, the course such as center of technology of plum steel company, ironworks experiment of more th......

为解决这个技术难题，梅钢公司技术中心、炼铁厂等经过。。。。。。关键词：热风炉基底技术难题热风炉，基底，材料

In order to solve in the distribution, isomerism and the dynamic Internet environment the digital library resource sharing, the semantic retrieval and the knowledge discovery difficult problem, designed the platform based on the grid Digital library knowledge, and the realization of the key technologies were discussed.

为解决广域、分布、异构和动态的Internet环境中数字图书馆资源共享、语义检索和知识发现的难题，设计了基于网格的数字图书馆知识服务平台，并对其实现的关键技术进行了讨论。

How to determine the isomorphism of graphs is a difficult problem of graph theory,which is not completely solved so far.S.M.

图同构的判定性问题是图论理论中的一个难问题，至今没有得到彻底解决。

The auto-control of air-valve is a difficult problem in the jigger control project, the capability of the auto-control of air-valve affects the delamination of the coal bed directly. So, it is important to study the control of the air-valve.

风阀自动控制一直是跳汰机控制的难点，而风阀控制性能的好坏直接影响着床层的分层效果，因此，对风阀控制的研究尤为重要。

However, It is difficult to specify the probabilistic model with a joint distribution function because of the large dimensions of the problem.

可是由于问题本身的维数，如何用联合分布来表示概率模型是件棘手的事情。

Jointer of offense is a difficult problem in theory and practice of criminology, and imaginative jointer of offenses causes more disputes for its unique structure.

犯罪竞合论是刑法学理论与实务上的一个难题，而想象竞合犯因其自身的独特结构所引起的争议更大。

Pachomius manual labour was organized as an essential part of the monastic life; and since it is a principle of the monks as distinguished from the mendicants, that the body shall be self-supporting, external work of one sort or another has been an inevitable part of the life ever since.

根据圣pachomius体力劳动组织作为一个重要组成部分寺院生活；以来，这是一个原则的和尚，作为有别于乞丐，该机构应自支撑，对外工作的这种或那种已一个必然的一部分，生活至今。

In order to study the effects of parametrical rolling on the ship movement and tilts, in allusion to ship's navigating in regular following waves, the equation of ship rolling motion is transformed into normal Mathieu equation by proper variable replacement when strong parametrical excitation in restoring moment varied according to sine or cosine wave.

为研究参数横摇对船舶运动和倾覆的影响，通过对船在规则波上随浪航行时，恢复力矩中出现的1个以正余弦规律变化的强参数激励项进行适当的变量置换，将船舶的横摇运动方程转换成标准形式的Mathieu方程。