模糊数四则运算的几何表示

本文利用空间解析几何方法对模糊数的四则运算给出了直观表示;并在几何直观分析的基础上,为模糊数的四则运算提出了一种比较简便可行的运算方法.     

一个泛函在组合论中的应用

从实变元x的降阶乘的线性表示式出发，给出一个以多项式为定义域，实数为值域的泛函的定义，由此泛函推出三个性质以及在组合论中的两个推论．     

一种新的模糊线性规划方法

本文详细研究了约束带有模糊系数型线性规划的模糊约束集的定义方法，给出了其隶属函数的规定原则和应满足的条件，并建议了两种具体的定义形式，从而得到了求解这种规划的新方法。     

一个加权的Erds-Mordell型不等式的指数推广

考虑了作者在文献[1]中给出的一个加权Erdos-Mordell型不等式的指数推广,得出了两个类似的结果,提出并应用计算机验证了一个更一般的猜想.     

Looking for structure in all the wrong places: Ramsey sentences, multiple realisability, and structure

‘Epistemic structural realism’ (ESR) insists that all that we know of the world is its structure, and that the ‘nature’ of the underlying elements remains hidden. With structure represented via Ramsey sentences, the question arises as to how ‘hidden natures’ might also be represented. If the Ramsey sentence describes a class of realisers for the relevant theory, one way of answering this question is through the notion of multiple realisability. We explore this answer in the context of the work of Carnap, Hintikka and Lewis. Both Carnap and Hintikka offer clear structuralist perspectives which, crucially, accommodate the openness inherent in theory change. Unfortunately there is little purchase for a viable form of realism in either case. Lewis’s approach, on the other hand, offers more scope for realism but, as we shall see, concerns arise as to whether a relevant form of structuralism can be maintained. In particular his thesis of Ramseyan humility undermines certain conceptions of scientific laws that the structural realist might naturally cleave to. Our overall conclusion is that the representational device of Ramsey sentence plus multiple realisability can accommodate either the structuralist or realist aspects of ESR but has difficulties capturing both.     

Ramsey数的新上界公式

对著名的组合数学问题——Ramsey数问题进行了研究,利用Ramsey数的有关性质和归纳法,得到并证明了Ramsey数的一个新上界公式,即N(q_1,q_2,…,q_t;2)≤(q_1+q_2+…+q_t-2t+2)!/[(q_1-1)!(q_2-1)!(q_3-2)!…(q_t-2)!],这个新的上界公式改进了几十年来组合数学和图论方面的专著和教科书中的相应结论,它对计算具体的Ramsey数值很有意义.     

自然数前n项幂的和及其分解性质

本文给出由S_K(n)=1~K 2~K … n~K,K=1,2,…的求和公式,得出S_K 1(n)的求和公式的简单方法,此法可顺便得出下一个伯努利数B_K 1。利用这个方法求出了1≤K≤41次幂的等幂和公式(按n的幂排列),以及B_(2K),K=1,2,…,20。另外,本文还给出S_K(n)的分解性质和S_K(n)分解的形式。     

含卤素基团振动波数关系(Ⅱ)

本文讨论了角锥形、平面形和四面体形含卤素基团的振动波数及其变化规律。组成及结构类似的含卤素基团,其振动波数按氟、氯、溴、碘顺序降低。这种规律性变化有很大覆盖面。     

方程sum from i＝1 to n of x_i／d_i≡0（mod1）的一个注记

设ｄ１，…，ｄｎ是ｎ个正整数，Ｉ（ｄ１，…，ｄｎ）表示方程∑ｎｉ＝１ｘｉ／ｄｉ≡０（ｍｏｄ１）（１≤ｘｊ≤ｄｊ－１，ｊ＝１，…，ｎ）的解的个数．本文研究计算Ｉ（ｄ１，…，ｄｎ）的两种已知减缩过程间的关系，还改进了Ｌ（ｄ１，…，ｄｎ）的下界，这里Ｌ（ｄ１，…，ｄｎ）表示当Ｉ（ｄ１，…，ｄｎ）＞０时，与其解所对应的Ｉ（ｄ１，…，ｄｎ）个正整数∑ｎｉ＝１ｘｉ／ｄｉ中最小者     

THE WEAK LAW OF LARGE NUMBERS WHEN EXTREME TERMS ARE EXCLUDED FROM SUMS

ＴＨＥＷＥＡＫＬＡＷＯＦＬＡＲＧＥＮＵＭＢＥＲＳＷＨＥＮＥＸＴＲＥＭＥＴＥＲＭＳＡＲＥＥＸＣＬＵＤＥＤＦＲＯＭＳＵＭＳ￥ＱＩＹｏｎｇｃｈｅｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＰｒｏｂａｂｉｌｉｔｙａｎｄＳｔａｔｉｓｔｉｃｓ，ＰｅｋｉｎｇＵｎｉｖｅｒｓｉｔｙ...