[試題] 102上 劉豐哲 實分析一 期末考

作者: t0444564 (艾利歐)   2015-01-28 10:33:18
課程名稱︰實分析一
課程性質︰數學研究所必選修、應用數學科學研究所必選修、數學系選修
課程教師︰劉豐哲
開課學院:理學院
開課系所︰數學系
考試日期︰2014年01月
考試時限:110分鐘
試題 :
              Real Analysis I (Fall 2013)
                Final Examination
1. (20%) A family {f_α} of integrable function on a measure space (Ω,Σ,μ)
  is called uniformly integrable if for any ε > 0, there is δ > 0 such that
  if A is contained by Σ with μ(A) ≦ δ, then ∫|f_α|dμ≦ε for all α.
                          A
  Show that if {f_n} is uniformly integrable sequence of functions on Ω which
  converges a.e. to an integrable function f on Ω, then
               lim ∫|f_n - f|dμ = 0.
               n->∞
                n
2. Let ω≧0 be integrable on R and let μ be a premeasure defined for open
  sets G in R^n by              n
                μ(G) = ∫ωdλ
                 n    G
  Denote by μ* the measure on R constructed from μ by Method I.
  (a) (6%) Show that μ*(S) = inf μ(G) where infimum is taken over all open
    sets G containing S.
  (b) (7%) Show that μ* is a Caratheodory measure and
                       n
               μ*(B) = ∫ωdλ
                    B
    for Borel sets B.          μ*           n
  (c) (7%) Show that L^n is contained by Σ and μ*(A) = ∫ωdλ if A
          n                     A
    belongs to L .
3. (20%) Define a function f on (0,∞) by
                 ∞ e^(-xt^2)
             f(x) = ∫

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