Some Properties of Aut$_∗(X)$ and the Subgroup Aut$_Σ(X)$

Let Aut$_∗(X)$ denote the group of homotopy classes of self-homotopy equivalences of $X$, which induce identity automorphisms of homology group. We describe a decomposition of Aut$_∗(X_1∨· · ·∨X_n)$ as a product of its simpler subgroups. We consider the subgroup Aut$_Σ(X)$ of all self homotopy classes α of $X$ such that $Σα = 1_{ΣX} : ΣX → ΣX$, and also give some properties of Aut$_Σ(X)$.     

有向图的基本群和覆盖（英文）

本文基于范畴理论,主要研究了有向图和其对应的无向图(简称为图)在不同同伦等价意义下基本群之间的关系,证明了覆盖映射所诱导的覆盖图和底图的基本群之间的同态是单同态.设G是连通有向图,G是G的万有覆盖,覆盖映射为p.我们证明了G的覆盖转化群D(G,p)同构于G在C-同伦意义下的基本群.     

Some Properties of Regular and α-Regular （LM）-Spaces

In this paper, we give some properties of regular (LM)-spaces and α-regular (LM)-spaces and investigate the relationship among them.     

Some Properties of an Operator on L^∞（△） and Its Applications

In this paper, we introduce an operator Hμ（z） on L^∞（△） and obtain some of its properties. Some applications of this operator to the extremal problem of quasiconformal mappings are given. In particular, a sufficient condition for a point r in the universal Teichmfiller space T（△） to be a Strebel point is obtained.     

A Note on the Witten‘s Invariants of Three Manifolds

The purpose of this note is to study the three manifold invariants Qp(ML).For lens spaces L(7,1)and (7,2),we compute Q5(L(7,1) and Q5(L(7.2)) concretely,which enables us to prove that the in-variants can distinguish homotopy equivalence manifolds.     

Some Results Concerning the Consistency of Ls and LAD Estimates of Multiple Regression（I）

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（Co）Homology and Universal Central Extension of Hom-Leibniz Algebras

Hom-Leibniz algebra is a natural generalization of Leibniz algebras and Hom-Lie algebras. In this paper, we develop some structure theory (such as (co)homology groups, universal central extensions) of Hom-Leibniz algebras based on some works of Loday and Pirashvili.     

The Convergence of γ^～s （b0hn - h1bn-1）

Abstract This paper computes the Thom map on γ₂ and proves that it is represented by 2b_2,0h_1,2 in the ASS. The authors also compute the higher May differential of b_2,0, from which it is proved that for 2 ≤ s < p - 1 are permanent cycles in the ASS. * Project supported by the National Natural Science Foundation of China (No.10501045), the Tianyuan Foundation of Mathematics (No.10426028) and the Fund of the Personnel Division of Nankai University.     

The Approximation Properties of Certain Interpolation Operators of Entire Exponential Type（1）

In this paper, the authers introduce certain entire exponential type interpolation operatots and study the convergence problem of these operatots in c(R) or Lp(R) (1≤p<∞)     

The Non—standard Characteristics of Functional Spaces K（X） and C0（X）

ＬｅｔＵｂｅａｓｔａｎｄａｒｄｕｎｉｖｅｒｓｅａｎｄＵｂｅａｎｅｎｌａｒｇｅｄｎｏｎｓｔａｎｄａｒｄｕｎｉｖｅｒｓｅｗｉｔｈｒｅｓｐｅｃｔｔｏＵ．ＸｉｓａｔｏｐｏｌｏｇｉｃａｌｓｐａｃｅｗｈｉｃｈｉｎｃｌｕｄｅｄｉｎｔｈｅｉｎｄｉｖｉｄｕａｌｓｅｔｏｆＵ，ｔｈａｔｉｓ，ＸＸ．Ｄｅｆｉｎｉｔｉｏｎ１　Ｆｏｒｅａｃｈｘ∈Ｘ，ｗｅｄｅｆｉｎｅｍ（ｘ）＝∩｛Ｖ：Ｖ∈Ｉｘ｝ａｎｄｃａｌｌｍ（ｘ）ｔｈｅｍｏｎａｄｏｆｘ（Ｉｘｉｓｔｈｅｏｐｅｎｎｅｉｇｈｂｏｒｈｏｏｄｏｆｘ）．Ｗｅｗｒｉｔｅｙ≈ｘｆｏ…     

Low Dimensional Cohomology of Hom-Lie Algebras and q-deformed W（2, 2） Algebra

This paper aims to study low dimensional cohomology of Hom-Lie algebras and the qdeformed W(2, 2) algebra. We show that the q-deformed W(2, 2) algebra is a Hom-Lie algebra. Also,we establish a one-to-one correspondence between the equivalence classes of one-dimensional central extensions of a Hom-Lie algebra and its second cohomology group, leading us to determine the second cohomology group of the q-deformed W(2, 2) algebra. In addition, we generalize some results of derivations of finitely generated Lie algebras with values in graded modules to Hom-Lie algebras.As application, we compute all αk-derivations and in particular the first cohomology group of the q-deformed W(2, 2) algebra.     

On the Volume Formulas of Cones and Orthogonal Multi-cones in S^n（1） and H^n（-1）

Abstract In the study of n-dimensional spherical or hyperbolic geometry, n≥ 3, the volume of various objects such as simplexes, convex polytopes, etc. often becomes rather difficult to deal with. In this paper, we use the method of infinitesimal symmetrization to provide a systematic way of obtaining volume formulas of cones and orthogonal multiple cones in Sⁿ(1) and Hⁿ(—1). (Dedicated to the memory of Shiing-Shen Chern)     

Estimation and Testing for the Parameters of AR（p）-ARCH（q） under Ordered Restriction

Suppose that the time series Xt satisfies{Xt=β1Xt-1… βpXt-p εt,εt=ξtht^1/2,ht=α0 α1εt-1^2… αqεt-q^2,(1)     

On Extension of Isometries Between the Unit Spheres of Normed Space E and lP（p 〉 1）

In this paper, we study the extension of isometries between the unit spheres of normed space E and lP（p 〉 1）. We arrive at a conclusion that any surjective isometry between the unit sphere of normed space lP（p 〉 1） and E can be extended to be a linear isometry on the whole space lP（p 〉 1） under some condition.     

The Quasi-Representation Theorem of the Conjugate Cone [Lβ（μ,X）]β^＊ （0 〈β 〈 1）

For 0 〈β 〈 1, the author once wrote a paper to deal with the representation problem of the conjugate cone [L^β[0, 1]β^＊ of complex β-nanach space L^β[0, 1]. In this paper, replacing [0, 1] with a Borel finite measure space （Ω,M,μ） and replacing the complex field C with a Banach space X, we study the representation problem of the conjugate cone [L^β（μ, X）]β^＊ of L^β（μ, X）, and obtain [L^β（μ, X）]β^＊≌L^∞ M^＋（μ, S）, called the Quasi-Representation Theorem of [L^β（μ, X）]β^＊.     

Existence and Nonuniqueness of Weak Solutions of the Initial-Boundary Value Problem for ut=u^σ div（｜△↓u｜^（p-2）△↓u）

In this paper, we study the existence and nonuniqueness of weak solutions of the initial and boundary value problem for ut =u^σ div(|△↓u|^(p-2)△↓u) with σ≥1. Localization property of weak solutions is also discussed.     

The Dichotomy Between Traces on d-sets F in R^n and the Density of D（R^n／Г） in Function Spaces

A space Apq^s （R^n） with A ： B or A = F and s ∈R, 0 〈 p, q 〈 ∞ either has a trace in Lp（Г）, where Г is a compact d-set in R^n with 0 〈 d 〈 n, or D（R^n／Г） is dense in it. Related dichotomy numbers are introduced and calculated.