关于FBZ-代数的几点注记

证明了FBZ-代数按所规定的偏序 ,确实是一偏序集 ,即若X是FBZ-代数 ,则 x∈X ,x≤x.讨论了FBZ-代数与BCI_代数的关系 .证明了满足条件x (yz) =y (xz)的FBZ_代数 ,如果令 X =X ,x y=yx ,0 =1,则 ( X , ,0 )一定是BCI-代数 ;反过来 ,若 (X , ,0 )是BCI-代数 ,令 X =X ,xy =y x ,1=0 ,则 ( X , ,1)是FBZ-代数 .还引入了正则FBZ -代数的概念 ,给出了正则FBZ-代数的一个特性 .     

关于BCI-代数的商代数的几点注记

设 X 为一个 BCI-代数,N,H 为 X 的理想,A 为 X 的子代数,X/N 为通常意义下的商代数,C_0为 X/N 的常元,C_0(?)H(?)N(?)A.今A/N={C_x∈X/N|x∈A}本文主要证明了以下几个结果:i)X/N=X/H;ii)A/N(?)A/N;iii)当 A 还是 X 的理想时,A/N=A/N.     

亚Hilbert代数

将Hilbert代数的等价公理系中的公理 ,x (yz) =(xy) (xz) ,换为条件较弱的x (yz) =y (xz) ,引入亚Hilbert代数 ,获得了以下结果 :(1)在亚Hilbert代数中x 1=1与x (yx) =1等价 ;(2 ) 1nx =x;(3)若x 1=1则xn 1=1.并给出亚Hilbert代数成为Hilbert代数的充要条件 : x,y ,z∈X ,x (yz) =(xy) (xz) .此外 ,还讨论了亚Hilbert代数与BCI_代数、FI代数 ,HFI代数、MV代数之间的联系 .     

高中数学知识点训练

代数 1.设Ⅰ=R,子集P={x|f(x)=0 },Q={x|g(x)=0},H={x|h(x)=0}则方程f~2(x) g~2(x)/h(x)=0的解集是( ) (A)P∩Q∩H (B)P∩Q (C)P∩Q∩H (D)P∩Q∪H 2.已知集合A={(x,y)|x y=1},映射f:A→B在f的作用下,点(x,y)的象是(2~X,2~y),则集合B是( ) (A){(x,y)|x y=2,x>0,y>0} (B){(x,y)|xy=1,x>0,y>0} (C){(x,y)|xy=2,x<0,y<0} (D){(x,y)|xy=2,x>0,y>0} 3.y=x~n(n∈Z)的图象只分布在第一、二象限,则n的集合一定是( ) (A)正偶数集合 (B)负偶数集合 (C)偶数集合 (D)以上都不是 4.函数y=2~x-1/2~x 1 ιn(x-1)/(x 1)是( ) (A)偶函数但不是奇函数     

对称亚BCI—代数

1982年,陕西师大雷天德付教授,引入广义结合BCI-代数的概念.定义 2一个BCI-代数〈X;*,0〉称为广义结合BCI-代数,是指;对(?)x∈X,0*(0*x)=x.徐州师院章仲英同志,于1984年引入对称BCI-代数的概念.定义3一个BCI-代数〈X;*,0〉称为对称BCI-代数,若对(?)x,y,z,μX∈,有以下对称条件成立:     

2003年安徽省高中数学竞赛(初赛)

一、选择题(每小题6分,共36分)1.定义:A -B ={x|x∈A且x B} .若M ={x|1≤x≤2 0 0 2 ,x∈N } ,N ={y|2 ≤y≤2 0 0 3,y∈N } ,则N -M等于(　　) .(A)M　　(B)N　　(C) { 1}　　(D) { 2 0 0 3}2 .函数f(x) =- (cosx)lg |x|的部分图像是(　　) .图13.若不等式a b≤m 4a2 b2 对所有正实数a、b都成立,则m的最小值是(　　) .(A) 2　　(B) 2　　(C) 2 3 4 　　(D) 44 .曲线2x2 -xy -y2 -x - 2y - 1=0和3x2 -4xy y2 - 3x y =0的交点有(　　)个.(A) 2　　(B) 3　　(C) 4　　(D)无穷多5 .设0   

集合与简易逻辑中的错题精析

一、概念不清造成的错解1.集合A={x∈R|y=2x2+1},B={y∈R|y=2x2+1},则A与B的关系是.错解:∵x∈R,y∈R,y=2x2+1,∴A=B剖析:∵A中的元素是x∈R,即A=R,B的元素是y,又y=x2+1≥1,B={y|y≥1},故正确答案是B真包含于A·二、忽视讨论造成的错解2.若集合A={x∈R|ax2+2x+1=0,a∈R}是单元素集,则a=.错解:依题意,二次方程ax2+2x+1=0有二等实根,∴Δ=4-4a=0,即a=1·剖析:∵a∈R,∴应分a=0和a≠0两种情况讨论,当a=0时,x=-21,合题意,当a≠0时,Δ=0,得a=1,∴正确答案是a=0或1.3.集合A={x|x2-3x+2=0},B={x|ax-2=0}若B真包含于A,求实数a组成的集合…     

2003年安徽省高中数学竞赛初赛试题及解答

一、单项选择题 (每小题 6分 ,共 3 6分 )1 定义 :A -B ={x|x∈A且x B},若M ={x|1≤x≤ 2 0 0 2 ,x∈N },N ={y|2≤ y≤ 2 0 0 3 ,y∈N },则N -M等于 (　 )(A)M　　 (B)N　　 (C) {1 }　　 (D) {2 0 0 3 }2 函数 f(x) =-(cosx)lg|x|的部分图像是 (　 )3 若不等式a +b≤m· 4a2 +b2 对所有正实数a、b都成立 ,则m的最小值是 (　 )(A) 2　　 (B) 2　　 (C) 2 34 　　 (D) 44 曲线 2x2 -xy -y2 -x -2 y -1 =0和 3x2 -4xy +y2 -3x +y =0的交点有 (　 )(A) 2个　 (B) 3个　 (C) 4个　 (D)无穷多个5 设 0   

数学奥林匹克高中训练题(72)

第一试一、选择题 (每小题 6分 ,共 36分 )1 .已知集合M ={x|x2 9y2 =9,x、y∈R},N ={x|x2 y2 - 2ax =0 ,x、y∈R ,|a|≤1 ,且a为常数 }.则M∩N =(　　 ) .(A) {x| |x| ≤1 }(B) {x| |x| ≤|a| }(C) {x|a - |a| ≤x≤a |a| }(D) {x| |x| ≤2 }2 .方程 (a - 1 ) (sin 2x c     

2006年高考数学(江西卷)试题及略解

一、选择题:本题共12小题,每小题5分,共60分.在每小题给出的四个选项中,只有一项是符合题目要求的.1.(理)已知集合 M={x|x/(x-1)~3≥0},N={y|y=3x~2 1,x∈R},则 M∩N等于()A.φ B.x{x|x≥1}C.{x|x>1} D.{x|x≥1或 x<0}(文)已知集合 P={x|x(x-1)≥0},Q={x|=1/(x-1)>0},则 P∩Q等于()A.φ B.x{x|x≥1}C.{x|x>1} D.{x|x≥1或 x<0}     

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.     

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。     

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.     

钱生钱!

我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了     

Inequalities for inscribed simplexes

The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex.