诚赴大业珠坛作基石——记中国珠算协会主要创始人之一李新

那些年，说李新搞珠算是“不务正业”者，不只是造反派。而在全国因搞珠算被指责为“不务正业”者，也不止李新一人。这种“欲加之罪”，常加在一个个真正的敬业如天的人们的头上。     

存在性命题的转化方法

众所周知：存在性命题： x∈M，P（M）的否定为全称命题：任意x∈M，P（M），同学们都能又快又准地把它写出来，可从没想过它还能有其它什么用处．实际上，它的用处可不小，同学们都有这样的感受，在做综合题时，最怕看到“存在”类字眼，不知该如何下手，有些综合题即使看了答案也不怎么懂，往往各有各的处理，巧妙各不同，没有一个统一的东西，很是头疼,不用怕，笔者教你一招，先看例题1．     

17世纪名画“几何学寓言”中的几何命题探析

以17世纪的一幅名画“几何学寓言”为素材,探讨其中的几何命题的证明以及命题的推广,试图从中获得一些思想启迪,为初中几何教学提供参考.     

经济复苏期的理财命题

“危机”,无疑是2009年使用频率最高的词语;“复苏”,或许是当前备受关注的又一热词。     

从循规蹈矩到“不务正业”

作为一个转型中的群体,中国一大批优秀CFO的整体形象已发生脱胎换骨的变化。     

谨防命题“悄悄”改变

数学问题的求解过程,实际上是问题的转化过程,条件由“隐”转化为“显”,结论由“暗”转化为“明”,这是人所共知的事实,也是求解数学问题的真实写照．本文所说的“改变”并非是这里的转化;而是将“此问题”改变为“彼问题”或是“此条件”改变为“彼条件”,这样一来,所求到的结论就可能是错误的．下面举例说明．     

保代眼中的“新动向”

IPO的舞台永远交融着资本市场的“魔力”和发审委的“权力”。对于冲刺IPO的公司而言,一字之差即能造就天壤之别。据统计显示,截至8月14日．46家公司被终止审查,另有24家公司处于“中止审查”状态。     

高一数学测试题（集合与命题）（90分钟）

一、填空题1 .设U ={x|0≤x <6 ,x∈Z} ,A ={ 1 ,3 ,5} ,则CuA =2 .用描述法表示所有非负奇数组成的集合 :3.用列举法表示集合A =x 6x+2 ∈Z,x∈N :4.写出方程x2 -x +1 =0的实根组成的集合5.已知集合A ={x|x∈R ,x≠ 1 } ,集合B ={x|x>- 1 ,x∈R} ,则A∪B =6.已知集合U =R ,A ={x|x≥ - 2 } ,B ={x|x≥4} ,则A∩CuB =7.如果x∈R ,那么数集 {x,x2 +3x}中x的取值范围是8.写出命题“若x2 +y2 =0 ,则x、y全为 0”的逆否命题 :9.写出“x>y”的一个必要不充分条件 :1 0 .向 48名学生调查对A、B两件事的态度 ,结果如下 :赞成A有 30人举手…     

探索朝鲜新市场

开辟新市场是创新的重要形式之一,无疑也是高收益的源泉。今天,当“中国制造”已经覆盖了几乎整个地球之际,还有什么地方是潜力较强且尚待开发的新市场？不必舍近求远,让我们看看身边的朝鲜。     

国际板“草率”不得

自今年以来,建立国际板正在成为继创业板之后,我国资本市场的又一个新热点。据相关方面的披露,建立面向海外公司的股票发行和交易市场,已经成为中国资本市场发展的中长期构想。     

Feedback control variables to restrain the Babesiosis disease

In this paper, we complete the study of the dynamics of a recognized continuous‐time model for the Babesiosis disease. The local and global asymptotic stability of the endemic state are established theoretically and experimentally. In addition, to restrain the disease in the original model when the endemic state exists, we propose and study the continuous model with feedback controls. The global stability of the boundary‐equilibrium point of this model is analyzed by means of rigorous mathematical methods. As an important consequence of this result, we propose a strategy to select feedback control variables in order to restrain the disease in the original model. This strategy allows us to make the disease vanish completely. In other words, the feedback controls are specially effective for restraining disease in the model. The validity of the established theoretical result is supported by a set of numerical simulations.     

How to divide the indivisible

A novel approach to the fair division problem is proposed, which is based on the concept of a priori estimates and ideas of dynamical systems theory. For several problems on the division of a resource with discrete components, this approach leads to explicit constructive solutions in cases for which even the existence of solutions has not been previously known.

     

How to Use the First FTC

<正>At the last time,we’ve learned the First Part of the Fundamental Theorem of Calculus.It shows how indefinite integration and definite integration are related.In the other words,it shows how anti-derivative and the area are related.Today,you’ll deeply understand the First FTC by using it.     

How not to discretize the control

In this short note, we address the discretization of optimal control problems with higher order polynomials. We develop a necessary and sufficient condition to ensure that weak limits of discrete feasible controls are feasible for the original problem. We show by means of a simple counterexample that a naive discretization by higher order polynomials can lead to non-feasible limits of sequences of discrete solutions. (© 2016 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim)     

升值之言该如何听

自今年6月中国暗示将松动人民币汇率以来,人民币升值幅度仅为0．4％,这大大低于华盛顿的期待,因此,中美两国的关系日益紧张起来。随着失业率的膨胀,以及选举年即将到来,美国国会再一次将人民币汇率摆上了议事日程：9月6日,华盛顿两位高官为缓和中美关系前往北京,就人民币及其他重要问题进行高峰会晤,以期达成共识。     

How to play MetaSquares

The rules of the game MetaSquares as well as computational results suggest to follow a “lattice” strategy. This strategy is presented, and by counting lattice points it is shown to be essentially best possible.