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felix2018鐵桿木蟲 (正式寫手)
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[求助]
各位學泛函的大神們請進!有六道小題希望可以幫忙! 已有2人參與
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此六道題都是泛函分析的習題,希望各位大神可以幫幫忙。 由于自己輸入的問題,所以在括號做了個解釋! )1.show that if x is compact,then given ε<0,there exist a finite set of points{xi}∈X,(i為下標)can be approximated to within ε by one of the xi for each x∈X,there is an xi such that |x-xi|<=ε 2.if Ωis bounded,what is the completion of Cc0 (空間下標c上標0)in the supremum norm?deduce that C2 0(空間下標2上標0)is not a banach space with this norm,treat similarly the case Ω=R m(m維歐式空間) 3.show that given s∈S(Ω),1<=p<∞,and ε>0,there exists an f∈C2 0(上標0下標2),such that ||f-s||Lp<ε(下標Lp空間),such that any point x∈X 4.let kㄈH(k屬于H),be a convex cone with vertex at 0.i.e,0∈k and λu+μv∈k,any λ,μ>0,any u, v∈k,assume in addition that k is closed.given f∈H,prove that u=Pk f (f在k上的投影)in characterized by the following properties.any u∈k,(f-u,v)<=0,any v∈k and (f-u,u)=0 5.let Ω be a measure space and let h:Ω→[0,∞) be a measurable function .let k={u∈L2(Ω),|u(x)|<=h(x),a.e.on Ω}(2為上標L2空間)check that k is a nonempty closed convex set in H=L2(Ω).determine Pk. 6.let cㄈH be a nonempty closed convex set and let T:c→c,be a monlinear contraction i.e |Tu-Tv|<=|u-v|,any u,v∈c 1)let {un}(n為下標)be a sequence in c such that un→u weakly and |un-Tun|→f Strong prove that u→Tu=f 2)deduce that if c is bounded and T(c)ㄈc,then T has a fixed point. [ Last edited by felix2018 on 2013-12-21 at 10:19 ] |

木蟲 (著名寫手)
鐵桿木蟲 (正式寫手)

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鐵桿木蟲 (正式寫手)

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鐵桿木蟲 (正式寫手)

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鐵桿木蟲 (正式寫手)

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