Jackson-Type inequality on the sphere

被引:29
作者
Ditzian, Z [1 ]
机构
[1] Univ Alberta, Dept Math Sci, Edmonton, AB T6G 2G1, Canada
关键词
moduli of smoothness; Jackson-type inequality; orthogonal matrices on R-d; spherical harmonics; K-functionals;
D O I
10.1023/B:AMHU.0000023207.17695.0d
中图分类号
O1 [数学];
学科分类号
0701 ; 070101 ;
摘要
In a recent paper, I introduced new moduli of smoothness for functions on the sphere which did not use averages and, as a result, had some interesting properties. The direct, Jackson-type, estimate of the best approximation by spherical harmonics using the new moduli will be proved here. Equivalence with the appropriate K-functionals will be given. Relations with the moduli used earlier will be shown and used to prove new results for these moduli.
引用
收藏
页码:1 / 35
页数:35
相关论文
共 19 条
[1]  
ASKEY R, 1975, CBMS NSF REG C SER A, V21
[2]   Best approximation and K-functionals [J].
Chen, W ;
Ditzian, Z .
ACTA MATHEMATICA HUNGARICA, 1997, 75 (03) :165-208
[3]   STRONG CONVERSE INEQUALITIES [J].
DITZIAN, Z ;
IVANOV, KG .
JOURNAL D ANALYSE MATHEMATIQUE, 1993, 61 :61-111
[4]   Averages on caps of Sd-1 [J].
Ditzian, Z ;
Runovskii, K .
JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS, 2000, 248 (01) :260-274
[5]   Averages using translation induced by Laguerre and Jacobi expansions [J].
Ditzian, Z ;
Felten, M .
CONSTRUCTIVE APPROXIMATION, 2000, 16 (01) :115-143
[6]   ON THE MARCHAUD-TYPE INEQUALITY [J].
DITZIAN, Z .
PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY, 1988, 103 (01) :198-202
[7]   A modulus of smoothness on the unit sphere [J].
Ditzian, Z .
JOURNAL D ANALYSE MATHEMATIQUE, 1999, 79 (1) :189-200
[8]   MODULI OF SMOOTHNESS AND K-FUNCTIONALS IN L(P), 0-LESS-THAN-P-LESS-THAN-1 [J].
DITZIAN, Z ;
HRISTOV, VH ;
IVANOV, KG .
CONSTRUCTIVE APPROXIMATION, 1995, 11 (01) :67-83
[9]   Fractional derivatives and best approximation [J].
Ditzian, Z .
ACTA MATHEMATICA HUNGARICA, 1998, 81 (04) :323-348
[10]  
Ditzian Z, 1993, ANAL MATH, V19, P13