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1、華南理工大學(xué)碩士學(xué)位論文Hardy不等式與非線性橢圓型雙調(diào)和奇性方程的Dirichlet問(wèn)題姓名:熊輝申請(qǐng)學(xué)位級(jí)別:碩士專業(yè):應(yīng)用數(shù)學(xué)指導(dǎo)教師:沈堯天20030501IIAbstractTherearethreemaintopicsstudiedinthepresentthesisThefirstistheHatdyinequalities,includingitsclassification,theproofoftheoptimali
2、tyoftheirconstantsandth出applicationsThesecondandthirdtopicsarerespectivelyweaklysingularproblemandstronglysingularproblemFollowinginproperorderandadvancinggraduallytheauthorfoundsseveralHardyinequalitiesfirst,whichcreate
3、theprerequisiteforexistenceandnonexistenceofnontrivialsolutionsofsingularproblemWithdiff口entsingularitytheauthorstudiestheappearanceanddisappearingofcriticaldimensionsforbiharmonicequationsTheHardyinequalitiesarefoundedi
4、nspace掣andclassifiedbytheorderoftheoperatorsWegiveeveryinequalityallaJileandprovetheoptimalEyoftheconstants,andweprovidethecorrespondingreachingfunctionsforcompletionFurthermore,weapplythemtononlinearellipticequationsWea
5、lsoanalysistheremaindertermsoftheoptimalHardyinequalities,andbyaddinglowordereven4linear”護(hù)norm,wemakethe;nequalitiesimproved,whichprovideamethodtodealwiththeproblemsofcriticaldimensionsandweaklycriticaldimensionsforpolyh
6、armonicoperatorsSolweknowitisonlytheoptimalconstantsthatcannotbeimprovedbutnottheinequalitiesthemselvesThetwosemilinearbiharmouicDirichletproblemstudiedaresolvedbymountainpasstheoremandEkeland’svariationalprincipleWhenPi
7、slowerthanthecriticalexponentand。superlinearweprovethere鋤atleasttwopositivesolutions缸1,t‘2∈W學(xué)p(Q)suchthatj(“1)0J(t上2)Astothesecondproblem,inthespaceW22(n),withthehelpofinterp枷inequalityweprovethereexistsatlesstonenontriv
8、ialsolutionU∈W20(n)inthecaseofexactlylinearyWealsostudythreesemilinearsingularproblems,0neiswithsubcriticalexponentandcriticalpotential,anotheri8withsubcriticalpotentialandcriticalexponentlthethirdiswithsubcriticalexpone
9、ntandcriticalpotentialinvolvinglogarithmByusingPohozaevidentityforsingularsolutionsinweightedSobolevspace,wegetanonexistenceresult,Andbyusingconcentratecornpactnessprinciple,wegettwodifferentresultsofexistenceofpositives
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