BEST APPROXIMATION FOR WEIERSTRASS TRANSFORM CONNECTED WITH SPHERICAL MEAN OPERATOR  

作　　者：L.T.Rachdi N.Msehli 

机构地区：[1]Département de Math'ematiques,Facult'e des Sciences de Tunis,2092 El-Manar,Tunisia [2]Département de Mathématiques et d'informatique,Institut National des Sciences Appliquées et de Technologie de Tunis,1080 Tunis,Tunisia

出　　处：《Acta Mathematica Scientia》2012年第2期455-470,共16页数学物理学报（B辑英文版）

摘　　要：Using reproducing kernels for Hilbert spaces, we give best approximation for Weierstrass transform associated with spherical mean operator. Also, estimates of extremal functions are checked.Using reproducing kernels for Hilbert spaces, we give best approximation for Weierstrass transform associated with spherical mean operator. Also, estimates of extremal functions are checked.

关 键 词：Weierstrass transform spherical mean operator best approximation repro-ducing kernel extremal function 

分 类 号：O177.1[理学—数学]