ON APPROXIMATION AND GENERALIZED TYPE OF ANALYTIC FUNCTIONS OF SEVERAL COMPLEX VARIABLES.pdfVIP
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ON APPROXIMATION AND GENERALIZED TYPE OF ANALYTIC FUNCTIONS OF SEVERAL COMPLEX VARIABLES.pdf
Ana1.Theory App1.
Vo1.27,No.2(2011),101—108
DOI10.1007/slO496.Ol1-0101.z
oN APPRoXIMATIoN AND GENERALIZED TYPE oF
ANALYTIC FUNCTIoNSoF SEVERAL
CoM PLEX VARIABLES
G.S.Srivastava
(IndianInstituteofTechnologyRoorkee,India)
SusheelKumar
(CentralUniversityofHimachalPradesh,India)
ReceivedMra.13,2009
@EditorialBoardofAnalysisinTheoryApplicationsandSpringer-VerlagBerlinHeidelberg2011
Abstract. Inthepresentpaper,westudythepolynomialapproximationofanalyticfunc—
tionsofseveralcomplexvariables.Thecharacterizationsofgeneralizedtypeofanalytic
functionsofseveralcomplexvariableshavebeenobtainedintermsofapproximationand
interpolationerrors.
Keywords:analyticfunction,Siciakextremalufnction,generalizedtype,approximation
errors,imterpolationerrors
AMS(2010)subjectclassification:32A05,30El0
1 Introduction
TheconceptofgeneralizedorderforanalyticfunctionswasgivenbySeremeta3[】andJanik[2
Hence,letL0denotetheclassoffunctionshsatisfyinghtefollowingconditions:
(i)h(x)isdefinedon[以,oo)andispositive,strictlyincreasing,differentiablenadtendsto∞
as __+∞ :
(ii)lim
Xtoo ,z()
foreveryfunctionlf,)suchthat )--+∞as__÷oo.
Let人denotetheclassoffunctionshsatisfyingthecondition(i)and
(iii) -1’
ofreveryc0,htatish(x)isslowlyincreasing.
102 G.S.Srivastavaetal:OnApproximationandGeneralizedTypeofAnalyticFunctions
LetKbeacompactsetinCN suchthattheSiciakextremalfunctionofK
K(z)=sup[1(p(z)l/:—polynomial,degp ,IIplIK 1,,z 1】,z∈CN,
iscontinuous,lI.IlKbeingthesupnormonK(see1【]and2【]).
Letg:cⅣ_-÷C,N 1,beafunctionanalyticinKR={z∈cN: (z)尺),R1.Now
for1rR,weput(g)=sup{lg(z)I: (z)=r).For ∈人nad卢∈LoSeremeta【
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