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ON SIMULTANEOUS WEAKLY-CHEBYSHEV SUBSPACES.pdf
Ana1.Theory App1.
Vo1.27,No.2(2011),117—124
DOI10.1007/s10496一Ol1.O117.4
oN SIM ULTANEoUSW EAKLY-CHEBYSHEV SUBSPACES
Sh.Rezapour
(AzarbaidjanUniversityofTarbiatMoallem,Iran)
H.Alizadeh
(AazadIslamicUniversiyt,Iran)
and
S.M .Vaezpour
(AmirkabirUniversiytofTechnolog~IranJ
ReceivedDec.14,2009
@EditorialBoardofAnalysisinTheoryApplicationsandSpringer-VerlagBerlinHeidelberg2011
Abstract. Inthispaper,weshallintroducenadcharacterizesimultaneousquasi—Chebyshev
(nadweakly-Chebyshev)subspacesofnormedspaceswihtrespecttoaboundedsetSby
usingelementsofhtedualspace.
Keywords:dualspace,bestsimultaneousapproximation,simultaneousquasi—Cheby,shev
subspace,simultaneousweakly—Chebyshevsubspace
AMS(2010)subjectclassification:41A65,46B20,41A50
1 Introduction
Let beasubspaceofthenormedspaceX andX∈X.Wesaythatw0∈W 1Sabest
approximationofXwheneverIIx—woll=d(x,W)=infw∈WIIx—wlJ.Wedenotethesetofall
bestapproximationsofXby ,().ItisknownthatPw()isaclosed,boundedandconvex
subsetforall ∈X.AsubspaceW iscalledpseudo—Chebyshev(proximina1)ifdimPwx)oo
(晰 )≠O)ofrall ∈x1【9].In2000,MohebiandRadjavigeneralizedthisnotiontoquasi—
Chebyshevsubspaces[9】11【o]
. Then,Mohebi,RezapourandMazaherigeneralizedhtenotionof
quasi-Chebyshevsubspacestoweakly—Chebyshevsubspaces[】)1【3_
. In2008,Shams,Mazaheri
andVaezpourprovidedthenotionofW—Chebyshevsubspaces[171
. Ontheotherhnad.thetheory
ofbestsimultnaeousapproximation isageneralizationofbestappr
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