ON APPROXIMATION OF SMOOTH FUNCTIONS FROM NULL SPACES OF OPTIMAL LINEAR DIFFERENTIAL OPERATORS WITH CONSTANT COEFFICIENTS.pdfVIP
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ON APPROXIMATION OF SMOOTH FUNCTIONS FROM NULL SPACES OF OPTIMAL LINEAR DIFFERENTIAL OPERATORS WITH CONSTANT COEFFICIENTS.pdf
Ana1.Theory App1.
Vo1.27,No.2(2011),187-200
Do110.1007/s10496—011.0187—3
oN APPROXIMATIoN oF SM ooTH FUNCTIoNSFRoM
NULL SPACESoF oPTIM AL LINEAR DIFFERENTIAL
OPERATORSW ITH CoNSTANT CoEFFICIENTS
v_esselin tchev
(UniversityofTexasatBrownsville, )
ReceivedNov.28,2010; RevisedMay7,2011
⑥ EditorialBoardofAnalysisinTheoryApplicationsandSpringer-VerlagBerlinHeidelberg2011
Abstract·Forarealvaluedfunctionfdefinedonafiniteinterval,weconsidertheprob.
。app。xim砒ing,h。mnu11spaces。fdifferentialoperators。ftheformLn(1l1)=
∑akV(,wheretheconstantcoefficients ∈Rmaybeadaptedtof.
k=0
Weprovethatforeachf∈c()( thereisaselectionofcoefficientsa1,…,日n)and
acorrespondinglinearcombination
Sn(f,)=∑bkek
七=1
offunctions (f)=P inthenullityofLwhichsatisfiesthefollowingJackson’stype
inequality:
)_ l,)f)JJ。。 IILn(f)ll,
where1Zn1=max1l,0 ,z一1,P,q 1,and一1+一1:1.
ForhteparticulraoperatorMn(厂)=厂+i/(2n)!f()hterateofapproximationbyhte
eigenvaluesof f0rnon-periodicanalyticfunctionsonintervalsofrestrictedlenght is
establishedtobeexponentia1.Applicationsinalgorithmsandnumericalexamplesraedis..
cussed
Keywords:approximationofanalyticfunction,differentialoperator,ufndamentalsetof
solutions
AMS(2010)subjectclassification:41A80,41A58
SupportedinpartbygrantHRD一0734800
188 、/:Vatchev:Approximationfrom NullSpacesofDifferentialOperators
1 Introduction
Theproblemofapproximatingarealvaluedfunctionfonafiniteinterval,bylinearcom—
binationsfromsubsetsofthesetE= eI一complexnumber}isstudiedextensively.The
mostclassical approach
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