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Letωbethespaceofallscalarvaluedsequences,and φitssubspacewithonlyfinitelymanynon zerocoordinates.AlinearsubspaceEofωiscalledasequencespace. Wesaythatanon zerovectorsequence {z(n) }inωisablocksequenceifthereexistsastrictlyincreasingsequenceofpositiveinteger… 相似文献
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1 IntroductionandMainResultsTheexistenceofpositivesolutionshasbeenestablishedforanonlinearsecondorderthree_pointboundaryvalueproblemoftheform-y″ =Q(x)f(y) ( 0 <x<1 ) ,y( 0 ) =0 ,y( 1 ) =αy( η) ( 1 )onlyveryrecentlyin [1 ] .Itwasassumedtherethat 0 <η <1 ,0 <αη <1 ,Q(x) ∈C( [0 ,1 ] ;R+) ,f(y)∈C… 相似文献
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Let(E,γ)bealocallyconvexspaceandE′itsconjugatespace.AE′beanequicontinu-ousseton(E,γ).ThewellknownAlaoglu-BourbakiTheorem([1]P248)statesthateache-quicontinuousseton(E,γ)isσ(E′,E)relativelycompactsubset.Nevertheless,equicontinuoussetisσ(E′,E)relativel… 相似文献
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