HELP: Integral

  • Thread starter BobSun
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  • #1
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Limit of an integral
1. Homework Statement
Evaluate:
the limit as n goes to [tex]\infty[/tex] of
[tex]\int^{1}_{0} (n^{3/2}x^{5/4})/(1+n^{2}x^{2})dx[/tex]
dx is the lebesgue measure

2. Homework Equations
I thought I could use the monotone convergence theorem or the dominated convergence theorem neither work.

3. The Attempt at a Solution
the intregrand is dominated by [tex]1/\sqrt{x}[/tex] but [tex]1/\sqrt{x}[/tex] isn't lebesgue integrable.
 

Answers and Replies

  • #2
HallsofIvy
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?? [itex]1/\sqrt{x}= x^{-1/2}[/itex] surely is Lebesque integrable on [0,1]. In fact, it is Riemann integrable and its integral from 0 to 1 is just [itex]\left 2x^{1/2}\right|_{x=0}^1= 2[/itex].
 

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