Some Properties Concerning the JL(X) and ΥJ(X) Which Related to Some Special Inscribed Triangles of Unit Ball

被引:3
作者
Ahmad, Asif [1 ]
Fu, Yuankang [1 ]
Li, Yongjin [1 ]
机构
[1] Sun Yat Sen Univ, Sch Math, Guangzhou 510275, Peoples R China
来源
SYMMETRY-BASEL | 2021年 / 13卷 / 07期
关键词
Banach space; geometric constant; uniformly non-square; uniformly convex; inequality; VON-NEUMANN-JORDAN; BANACH-SPACES; GEOMETRIC CONSTANT; CONVEXITY; JAMES; SMOOTHNESS; SEMICIRCLE; MODULUS;
D O I
10.3390/sym13071285
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
In this paper, we will make some further discussions on the J(L)(X) and Upsilon(J) ( X) which are symmetric and related to the side lengths of some special inscribed triangles of the unit ball, and also introduce two new geometric constants L-1 (X, Delta), L-2 (X, Delta) which related to the perimeters of some special inscribed triangles of the unit ball. Firstly, we discuss the relations among J(L) (X), Upsilon(J) (X) and some geometric properties of Banach spaces, including uniformly non-square and uniformly convex. It is worth noting that we point out that uniform non-square spaces can be characterized by the side lengths of some special inscribed triangles of unit ball. Secondly, we establish some inequalities for J(L) (X), Upsilon(J) ( X) and some significant geometric constants, including the James constant J (X) and the von Neumann-Jordan constant C-NJ(X). Finally, we introduce the two new geometric constants L-1 (X, Delta), L-2 (X, Delta), and calculate the bounds of L-1 (X, Delta) and L-2(X, Delta) as well as the values of L-1 (X, Delta) and L-2 (X, Delta) for two Banach spaces.
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页数:13
相关论文
共 32 条
[1]   Geometric mean and triangles inscribed in a semicircle in Banach spaces [J].
Alonso, Javier ;
Llorens-Fuster, Enrique .
JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS, 2008, 340 (02) :1271-1283
[2]  
Banas J., 1986, B POL ACAD SCI MATH, V34, P287
[3]   Triangles inscribed in a semicircle, in Minkowski planes, and in normed spaces [J].
Baronti, M ;
Casini, E ;
Papini, PL .
JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS, 2000, 252 (01) :124-146
[4]   Convexity, smoothness and moduli [J].
Baronti, Marco ;
Papini, Pier Luigi .
NONLINEAR ANALYSIS-THEORY METHODS & APPLICATIONS, 2009, 70 (06) :2457-2465
[5]  
Chidume C, 2009, LECT NOTES MATH, V1965, P1
[6]   The von Neumann-Jordan constant for the Lebesgue spaces [J].
Clarkson, JA .
ANNALS OF MATHEMATICS, 1937, 38 :114-115
[7]  
Clarkson JA, 1936, T AM MATH SOC, V40, P396
[8]   Uniform convexity in factor and conjugate spaces [J].
Day, MM .
ANNALS OF MATHEMATICS, 1944, 45 :375-385
[9]   On a generalized James constant [J].
Dhompongsa, S ;
Kaewkhao, A ;
Tasena, S .
JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS, 2003, 285 (02) :419-435
[10]   New Geometric Constants in Banach Spaces Related to the Inscribed Equilateral Triangles of Unit Balls [J].
Fu, Yuankang ;
Liu, Qi ;
Li, Yongjin .
SYMMETRY-BASEL, 2021, 13 (06)