一类涉及两个单形的三角不等式及其应用

应用解析方法和几何不等式理论研究了n维欧氏空间En中涉及两个n维单形的几何不等式问题,建立了涉及两个单形的一类三角不等式.作为其应用,获得了涉及两个单形及其内点的几何不等式,特别,获得了n维单形与其垂足单形的体积的一类关系式,改进了关于垂足单形体积的几类几何不等式.     

关于垂足单形的两类不等式

本文建立了垂足单形的两个不等式，作为其特例得到切点单形的几个不等式。     

双曲空间中Veljan-Korchmaros型不等式及应用

本文研究了双曲空间Hn(K)中n维高维单形的几何不等式问题.利用距离几何的理论与方法,获得了涉及n维双曲单形体积,侧面积与棱长的几个几何不等式,这些几何不等式是双曲单形几何不等式的基础.     

单形内任一点的一个含参不等式

本文证明了与ｎ维单形内部任意一点有关的一个含参数不等式,并应用它得到了几个与ｎ维单形体积有关的不等式。     

关于双曲空间中n维Pedoe不等式及应用

本文应用距离几何的理论与方法,研究了双曲空间中n维单形的几何不等式问题,建立了双曲空间中涉及两个单形棱长的n维Pedoe不等式和彭-常不等式,由此获得双曲空间n维单形的一些新的不等式.     

关于N维单形的一类不等式

本文旨在建立一类关于N维单形中有关元素长度比的不等式。这样的不等式在N维单形中是不多见的。     

关于高维单形体积的不等式

给出了高维单形与界面有关的体积不等式和与二面角有关的体积不等式,进而建立正则单形的有别于定义式的体积公式.     

球面空间中的Pedoe不等式与张-杨不等式及应用

本文应用距离几何的理论与方法,研究了n维球面空间中n维单形与有限点集的几何不等式问题,建立了球面空间中n维单形一种形式的Pedoe不等式与有限点集一种形式的张-杨不等式,并应用它获得n维球面空间中Veljan-Korchmaros型不等式与Finsler-Hadwinger型不等式.     

涉及两个单形的几何不等式及应用

建立了涉及两个n维单形的几个不等式,推广了一些重要几何不等式.     

关于单形一个对偶式的商榷与两个新的对偶式

讨论了n维欧氏空间E^n中n维单形不等式的对偶式．利用距离几何理论与解析方法，建立了n维单形两个不等式的对偶式，指出了最近所建立的单形Finsler-Hadwiger不等式的A维对偶式是错误的．     

Triangle inequalities associated with the vertex angles and dihedral angles of a simplex and their applications

In this paper, a class of triangle inequalities associated with the vertex angles and dihedral angles of a simplex is given. As an application, we improve an inequality on the volume of the pedal simplex. Received 3 July 2000.     

预给二面角的单形在球面型空间Sn,r的嵌入

本文获得预给二面角的单形嵌入球面型空间Ｓ_n,r的一个充分必要条件，并利用它得到关于球面单形二面角的两类几何不等式。     

An inequality for n-dimensional sines of vertex angles of a simplex with some applications

In this paper, we obtain an inequality for n-dimensional sines of vertex angles of a simplex. From this inequality, we obtain some important inequalities for a simplex.     

Vertex Angles of a Simplex in Hyperbolic Space H n

For an n-simplex in H ⁿ or S ⁿ , we give sine theorems and their results for kth-order vertex angles which are defined in this paper. The Gram and edge matrices, and polar simplex of n-simplex in H ⁿ or S ⁿ are used to prove the theorems and their results.     

Mathematical modeling of interrelationships among cutting angles,setting angles and working angles of single-point cutting tools

The angles of a cutting tool play a key role in determining its cutting efficiency. However, once the tool has been mounted on a machine tool, setting errors inevitably cause the working angles of the tool to deviate slightly from the designed cutting angles. Accordingly, this study develops mathematical models to analyze the interrelationships among the tool angles, the setting angles and the working angles. In the proposed approach, a process of homogeneous coordinate transformation is employed to develop a kinematic model of the cutting tool such that the working angles can be derived given the tool angles and setting angles. Mathematical formulae are then developed to inversely derive the tool angles required to generate the specified working angles given prior knowledge of the setting angles. An illustrative numerical example is presented to demonstrate the validity of the proposed approach. Overall, the numerical results confirm that the methodology presented in this study provides a comprehensive, simple and versatile means of modeling a variety of conventional single-point cutting tools.     

Two Theorems on Volume and Dihedral Angles of a n—dimensional Simplex

In this paper,we obtain thorem 1 on volum of a n-dimensional simplex and theorem 2 on dihedral angles of a simplex.Besides.We obtain Vasic inequality in E^n and its extension.The results in this paper contain and improve the results in paper[1]、[2]、[3]、[4].     

Some geometric inequalities in non-euclidean space

In this paper, we obtained three geometric inequalities for theu-dimensional polar sines and the dihedral angles of ann-dimensional simples. Besides, we obtained an inequality for the dihedral angles of ann-dimensional simplex in then-dimensional hyperbolic spaceH _n.Project Supported by National Natural Foundation P. R. China     

单形正弦定理的再推广

本文利用Grassmann代数建立n维欧氏空间中单形的k级n-k s维顶点角的概念，在此基础上对单形的正弦定理再作推广，并获得单形新的一类体积公式和一个几何不等式．