一个五阶图与路及圈的联图的交叉数

确定图的交叉数是NP-complete问题,现有的关于联图的交叉数的结果比较少,为此,讨论了五阶图4G分别与nK1,Pn及Cn的联图的交叉数.     

一个六阶图与路联图的交叉数

探讨一个六阶图与路的联图的交叉数．利用完全二部图k6,n的交叉数结果,证明了该六阶图与路的联图的交叉数为：Z（6,n）＋n＋1,n≥2．     

关于度为10且a_1=1的距离正则图的参数讨论

利用交叉表、距离正则图的性质及已有结论对k=10,a1=1的距离正则图的交叉数进行了讨论,得到的结论准确地刻画了k=10,a1=1的距离正则图的性质,利用此结论可对k=10,a1=1的距离正则图进行分类。     

关于度为10且a1=1的距离正则图的参数讨论

利用交叉表、距离正则图的性质及已有结论对k=10,a1=1的距离正则图的交叉数进行了讨论,得到的结论准确地刻画了k=10,a1=1的距离正则图的性质,利用此结论可对k=10,a1=1的距离正则图进行分类.     

笛卡尔积图Tn×Cm的交叉数

两个图G1和G2的笛卡尔积图G1×G2定义为如下的图:V(G1×G2)=V(G1)×V(G2),E(G1×G2)={(u1,u2)(v1,v2)|u1=v1且u2v2∈E(G2),或者u2=v2且u1v1∈E(G1).图的交叉数是图论中的一个重要拓扑参数,而确定图的交叉数是一个完全NP-问题.本文确定了若干树Tn(n≤4)与圈Cm的笛卡尔积图的交叉数.     

响球

材料:硬包装带、酒瓶盖。制作方法: ①一个响球需要六根60厘米长的硬塑料包装带。先取四根包装带,互相交叉,如图一。②将图一中的1、3带托起,与2、8带交叉的中间夹一根包装带,2、1带交叉,固定成一个五角星,如图二。     

笛卡尔积图Tn×Cm的交叉数

两个图G1和G2的笛卡尔积图G1×G2定义为如下的图：V（G1×G2）=V（G1）×V（G2）,E（G1×G2）={（u1,u2）（v1,v2）｜u1=v1且u2v2∈E（G2）,或者u2=v2且u1v1∈E（G1）}．图的交叉数是图论中的一个重要拓扑参数,而确定图的交叉数是一个完全胛一问题．本文确定了若干树Tn（n≤4）与圈Cm的笛卡尔积图的交叉数．     

一个五阶图与n个孤立点及路的联图的交叉数

摘要：目前已经确定的两个图的联图的交叉数结果比较少,为此讨论了五阶图G18分别与nK1,Pn的联图的交叉数,得到了cr（G18＋nK1）=Z（5,n）＋n＋[n/2],n≥i;cr（G18＋Pn）=Z（5,n）＋n＋[n＋2,n≥2．其中nK1是n个孤立点构成的图,只是Pn个点的路．     

参数为ar＋2=4的距离正则图

利用距离正则图的交叉表及性质对k=10，a1=1的距离正则图的参数进行了讨论，可对其得到的结论进行分类。     

参数为ar+2=4的距离正则图

利用距离正则图的交叉表及性质对k=10,a1=1的距离正则图的参数进行了讨论,可对其得到的结论进行分类.     

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.     

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.     

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?     

Social and Cultural Influence on Word Meaning

Different nations have different social cultures, and the social culture of every nation is developing with the development of the nation, language is greatly influenced by social culture, which enables language to possess national and historical characteristics. Word is the smallest, independent, meaningful linguistic unit of language. It can well reflect the national and historical characteristics. From synchronic aspect, the social and cultural influence on word meaning is mainly embodied in conceptual and associative meanings of word. The incorrespondence of word meaning is a phenomenon that exists in both conceptual and associative meanings of word among different languages. From diachronic aspect, the development of social culture causes some changes of word meaning to some extent. Therefore, social culture plays a key role in vocabulary learning and mastery of a language.     

汉字倒说

汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。     

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.