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A HYBRID FIXED POINT RESULT FOR LIPSCHITZ HOMOMORPHISMS ON QUASI-BANACH ALGEBRAS.pdf
Ana1.Theory App1.
Vo1.27,No.2(2011),109-116
DOI10.1007/sl0496.0¨.0109.4
A HYBRID FIXED PoINTRESUI ’FoR LIPSCHITZ
HOMOMORPHISMSoNQUASI-BANACHALGEBRAS
Sh.Rezapour and M .Derafshpour
(AzarbaidjanUniversityofTarbiatMoallem,Iran)
ReceivedMar.16,2009
@ EditorialBoardofAnalysisinTheory&ApplicationsandSpringer—VerlagBerlinHeidelberg2011
Abstract.Weshallgeneralizetheresultsof9【]aboutchraacterizationofisomorphismson
quasi—Banachalgebrasbyprovidingintegraltypeconditions.Also,weshallgivesomenew
resultsinthiswayandfinally,givearesultabouthybridfixedpointoftwohomomorphisms
onquasi—Bnaachalgebras.
Keywords:homomorphism,hybridfixedpoint,integral—ytpecondition,P—noFm,quasi-
Banachatgebra
AMS(2010)subjectclassification:47H10,46B03,47B48
1 Introduction
Thestabilityproblem offunctionalequationsoriginatedfrom aquestionofUlam[12】con—
cerningthestabilityofgrouphomomorphisms:Let(GI,)beagroupand(G2,◇,d)beametric
group.Given£0,doesthereexist (£)0suchhtatifamappingh:Gt-_÷G2satisfieshte
inequality
((半y),h(x)oh(y))
forall,Y∈G1,htenthereisahomomorphismH:G1—}G2withd(hx),日())£ofrall
∈GI? Ifhtena swerisaffirmative.wewouldsayhtattheequationofhtehomomorphism
半),)=n(x)oH(y)isstable.Theconceptofstabilityofrafunctionalequationariseswhen
wereplacehtefunctional equationbyaninequalitywhichactsasaperturbationofhteequation.
Thus,htestabilityquestionoffunctionalequationsisthathowdohtesolutionsofhteinequality
differfrom htoseofhtegivenfunctionalequation?
Hyers7[]gaveafirstaffimr ativena swertohtequestionofUlam ofrBanachspaces
. LetX
nadYbeBnaachspaces.Assumethatf:X—Ysatisties
, +),)一, )一f(Y)ll £
110 Sh.Rezapouret
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