在CP（2k＋1）上的定向逆转的光滑对合

ｋ为一非负整数．ＣＰ（２ｋ＋１）为复２ｋ＋１维射影空间．我们把ＣＰ（２ｋ＋１）作为一个闭２（２ｋ＋１）维光滑流形．２ｋ＋１为ＣＰ（２ｋ＋１）上的一个定向逆转的光滑对合，使２ｋ＋１［ｚ０，ｚ１，…，ｚ２ｋ＋１］＝［ｚ０，ｚ１，…，ｚ２ｋ＋１］，其中ｚｉ表示复数ｚｉ的共轭．本文证明了：（ｉ）任何一个在ＣＰ（２ｋ＋１）上的定向逆转的光滑对合等变协边于τ２ｋ＋１因此任何一个在ＣＰ（２ｋ＋１）上的定向逆转的光滑对合的等变协边类为零．（ｉｉ）在ＣＰ（２ｋ＋１）上的一个非平凡的定向逆转的光滑对合的不动点集必为ＧＰ（２ｋ＋１）的（２＋１）维闪光滑子流形．     

一类线性errors－in－variables模型的参数强相合估计及其a．s．收敛速度

本文讨论了如下一类线性ｅｒｒｏｒｓ－ｉｎ－ｖａｒｉａｂｌｅｓ模型——多元线性结构关系模型β′ｘｋ＋α＝０，ξｋ＝ｘｋ＋εｋ．｛ｋ＝１，２，…，ｎ．其中，｛ｘｋ：ｋ＝１，２，…，ｎ｝为一组ｉ．ｉ．ｄ．的ｍ维随机向量，｛εｋ：ｋ＝１，２，…，ｎ｝是ｉ．ｉ．ｄ．的随机误差，Ｅ（ε１）＝０，Ｖａｒ（ε１）＝σ２Ｉｍ．且｛ｘｋ：ｋ＝１，２，…，ｎ｝与｛εｋ：ｋ＝１，２，…，ｎ｝相互独立．在一些条件下，我们证明了估计量β，α，σ２的强相合性、唯一性，并给出了估计量的收敛速度为ｏ（ｎ－１－１ｑ），这里ｑ∈［１，２）．对于Ｅ（ｘ１）ｕ１和Ｖａｒ（ｘ１）Ｖｘ的估计也得出了同样的结果     

一维齐次Cantron集的Hausdorff维数

设｛ｎｋ，ｋ１｝为一正整数序列，｛ｃｋ，ｋ１｝为一正实数序列，满足ｎｋ２，０＜ｃｋ＜１，ｎｋｃｋ１．设Ｅ为由｛ｎｋ，ｋ１｝，｛ｃｋ，ｋ１｝定义的齐次Ｃａｎｔｏｒ集．本文证明集Ｅ的Ｈａｕｓｄｏｒｆ维数为ｄｉｍＨＥ＝ｌｉｍｋ→∞ｌｏｇｎ１ｎ２…ｎｋ－ｌｏｇｃ１ｃ２…ｃｋ     

鞅差几何级数的重对数律

设｛Ｘｋ，Ｆｋ，ｋ≥０｝是（Ω，Ｆ，Ｐ）上的鞅差序列，在本文中我们讨论了以｛Ｘｋ｝为系数的幂级数Ｓ（β＝Σ∞ｋ＝０βｋＸｋ，当β↑１时的渐近行为，本文证明了：如果│Ｘｋ│≤ｃ，Ｅ（Ｘ＾２ｋ│Ｆｋ－１）＝１，则有下面的重对数律成立ｌｉｍβ↑１√１－β＾２／√２ｌｏｇｌｏｇ（１－β＾２）－１Ｓ（β）＝１ａ．ｓ。     

Ramsey数r（k,l）的新下界公式

本文给出并证明了Ｒａｍｓｅｙ数ｒ（ｋ，ｌ）的一个新下界公式ｒ（ｋ，ｌ）≥１．５（ｋ－１）（ｌ－１），此下界公式与文献［１，２］所给出的下界公式ｒ（ｋ，ｌ）＞（ｎ２＾ｎ／２）／（ｅ√２，ｎ＝ｍｉｎ（ｋ，ｌ）相比，当ｋ，ｌ较小时，或ｋ，ｌ相差较大明要优越。     

也谈实二次域类数的可除性

设ｄ无平方因子，ｈ（ｄ）是二次域Ｑ（ｄ）的类数，本文证明了：若１＋４ｋ２ｎ＝ｄａ２，ａ，ｋ＞１，ｎ＞２为正整数，且ａ＜０．９ｋ３５ｎ或ｎ的奇素因子ｐ和ｋ的素因子ｑ均适合（ｐ，ｑ－１）＝１，则除（ａ，ｄ，ｋ，ｎ）＝（５，４１，２，４）以外，ｈ（ｄ）≡０（ｍｏｄｎ）．同时，我们猜测：上述结果中的条件（ｐ，ｑ－１）＝１是不必要的．     

自然数方幂和的一个性质的证明

自然数方幂和的一个性质的证明湖南浏阳十一中刘会成令Ｓｋ（ｎ）＝１ｋ＋２ｋ＋…＋ｎｋ（ｋ≥０，ｋ∈Ｚ）．文［１］，［２］，［３］均提到下面一个性质：Ｓ２ｋ（Ｎ）＝Ｓ２（ｎ）Ｐ２（ｎ）（ｉ）Ｓ２ｋ＋１（ｎ）＝Ｓ２１（ｎ）Ｐ１（ｎ）（ｉｉ）其中ｋ为自然数，...     

限距组合初探

限距组合初探李平龙（江苏省灌云县中学２２２２００）自集合｛１，２，３，．．．，ｎ｝中选出ｋ个数ｊ１，ｊ２，．．．，ｊｋ，使之满足：称数组（ｊ１，ｊ２，．．．，ｊｋ）为从ｎ个元素中取出ｋ个元素且限距为ｍ的组合，其组合数简记为Ｃ（ｎ，ｋ，ｍ），显见文［１...     

Camina－Gagen定理的一个推广（Ⅱ）

设Ｇ是２－（ｖ，ｋ，１）设计Ｄ上的自同构群的一个子群，且是线－本原．如果（Ｖ，ｋ）＝ｋ／ｋ２，ｋ２≤１０．则Ｇ也是点－本原的。     

数据插值和共轭函数

设Ｇ（ｚ）在｜ｚ｜＜ρ（ρ＞１）中解析，且数据Ｒｅ［Ｇ（ｅｊ２ｋπ／ｎ）］；ｋ＝０，１，…，ｎ－１已给出，其中ｎ＝２ν＋１，本文构造了一个ν次多项式Ｐν（ｚ）满足插值条件Ｒｅ［Ｐν（ｅｊ２ｋπ／ｎ）］＝Ｒｅ［Ｇ（ｅｊ２ｋπ／ｎ）］，ｋ＝０，１，…，ｎ－１．并估计了误差‖Ｇ（ｅｊω）－Ｐν（ｅｊω）‖．此外，还给出了一个Ｗａｌｓｈ类型的超收敛定理．     

Extreme values of the sum of squares of degrees of bipartite graphs

In this paper we determine the minimum and maximum values of the sum of squares of degrees of bipartite graphs with a given number of vertices and edges.     

Estimation of the number of components of finite mixtures of multivariate distributions

An estimator of the number of components of a finite mixture ofk-dimensional distributions is given on the basis of a one-dimensional independent random sample obtained by a transformation of ak-dimensional independent random sample. A consistency of the estimator is shown. Some simulation results are given in a case of finite mixtures of two-dimensional normal distributions.     

Eigenvector p-Bases of Rings of Constants of Derivations

Let A be a UFD of characteristic p > 0, let 𝒵 be a set of some eigenvectors of a derivation of A. We prove, under some additional assumptions, a necessary and sufficient condition for 𝒵 to be a p-basis of the minimal ring of constants containing 𝒵. The main preparatory result is the unique decomposition theorem with respect to a factor from a given subalgebra containing A^p.     

Galois Structure of K-Groups of Rings of Integers

N/Kbe a Galois extension of number fields with finite Galois group G.We describe a new approach for constructing invariants of the G-module structure of the K groups of the ring of integers of N in the Grothendieck group of finitely generated projective Z[G]modules. In various cases we can relate these classes, and their function field counterparts, to the root number class of Fröhlich and Cassou-Noguès.     

有资格限制的指派问题的求解方法

在实际的指派工作中，常会遇到某个人有没有资格去承担某项工作的问题，因此，本建立了有资格限制的指派问题的数学模型。在此数学模型中，将效益矩阵转化为判定矩阵，由此给出了判定此种指派问题是否有解的方法；在有解的情况下，进一步将效益矩阵转化为求解矩阵，从而将有资格限制的指派问题化为传统的指派问题来求解。最后给出了一个数值例子来说明这样的处理方法是有效的。     

Number of connected components of groups of real points of adjoint groups

We present a unified approach to compute the number of connected components in the group of real points of adjoint almost simple real algebraic groups.     

Radius of convexity of certain classes of analytic functions

We consider the classes of analytic functions introduced recently by K.I. Noor which are defined by conditions joining ideas of close-to-convex and of bounded boundary rotation functions. We investigate coefficients estimates and radii of convexity.     

On Sums of Coefficients of Products of Polynomials

We study the nilpotency of the sums of all coefficients of some sorts of products of polynomials over reversible, IFP, and NI rings, and introduce an SCN ring as a generalization. We characterize SCN rings in relation with related ring properties, and also provide several useful properties and ring extensions of SCN rings.     

Convergence of sequences of sets of associated primes

It is a well-known result of M. Brodmann that if is an ideal of a commutative Noetherian ring , then the set of associated primes of the -th power of is constant for all large . This paper is concerned with the following question: given a prime ideal of which is known to be in for all large integers , can one identify a term of the sequence beyond which will subsequently be an ever-present? This paper presents some results about convergence of sequences of sets of associated primes of graded components of finitely generated graded modules over a standard positively graded commutative Noetherian ring; those results are then applied to the above question.