环Z4上伴随矩阵的反问题

本文研究环Z4上伴随矩阵的反问题的存在性,给出两种类型的矩阵的伴随还原矩阵的个数和具体求法;同时用一个例子说明其余矩阵的伴随矩阵的反问题的不确定性。进一步完善了伴随矩阵的结论。     

矩阵的伴随矩阵A*

伴随矩阵是一个重要的概念,它是在讨论矩阵可逆的充分必要条件时引入的,在矩阵的运算和应用中起到非常重要的作用.通过研究伴随矩阵与逆矩阵的关系,可以推导出方阵的逆矩阵的计算公式,从而解决方阵求逆的问题.同时,伴随矩阵的性质也相当重要.本文主要从伴随矩阵的定义及构成、伴随矩阵的性质及其应用和特殊矩阵的伴随矩阵的性质三个方面介绍了伴随矩阵的相关知识.     

方阵的左伴随还原阵

研究了方阵A的左伴随还原矩阵的存在性问题，给出了左伴随还原矩阵的存在形式，进一步完善了伴随还原矩阵的结论．     

关于伴随矩阵性质的讨论

伴随矩阵在矩阵的运算和应用中起着非常重要的作用.伴随矩阵A*与矩阵A、矩阵A的逆矩阵A-1、矩阵A的转置矩阵A′、矩阵A′的行列式有着密切联系,伴随矩阵A*的行列式和秩也有其特殊性质.     

正规矩阵的性质及判定

根据伴随矩阵以及全转置矩阵的性质,研究了正规矩阵的若干性质,得到了正规矩阵的若干等价刻画．特别地,得到了高次混合伴随阵正规以及分块矩阵正规的充分必要条件．     

与矩阵A的伴随矩阵A^＊有关的几个技巧

关于矩阵A的伴随矩阵A^＊是一个非常重要的矩阵,但有关它的命题书上几乎没有涉及,本文举出了有关它的几个命题,并加以证明。     

求逆矩阵的方法总结

本文先总结了求逆矩阵常用的一般方法:即利用伴随矩阵法求逆矩阵和用初等变换法求逆矩阵。接着,在通常的这两种求逆矩阵方法的基础上得到另外两种用初等变换求逆矩阵的方法。     

浅议伴随矩阵的若干性质

本文借助于一般矩阵的性质,来研究伴随矩阵,加以叙述,得到了伴随矩阵的几个特性。     

伴随矩阵的秩

本文研究了矩阵与其伴随矩阵的秩之间的关系,得出结论并给出应用.     

可逆矩阵及其伴随矩阵、逆矩阵的一些共同特性

文章讨论了可逆矩阵及其伴随矩阵、逆矩阵的一些共同特性,得到了两个重要结论。其一,如果A、A-1、及A＊中有一个矩阵的每一行（列）的所有元素之和均为同一常数,则另外两个矩阵的每一行（列）的所有元素之和也均为同一常数;其二,当｜A｜=±1时,如果A、A-1、及A＊中有一个矩阵的每一元素均为整数,则另外两个矩阵的每一元素也均为整数。     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

Western and Eastern culture differences in commercial field

The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity.     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

风的曲线

Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose.     

团图为数的图中的闭团贯数

Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.