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November 28th, 2013, 09:18 PM  #1 
Newbie Joined: Nov 2013 Posts: 9 Thanks: 0  can't understand the proof of "Interchange of integration"
<Introduction to Calculus and Analysis>by courant (vol 2 page 81)

November 28th, 2013, 09:20 PM  #2 
Newbie Joined: Nov 2013 Posts: 9 Thanks: 0  Re: can't understand the proof of "Interchange of integratio
if the last equation is right, do it mean u(x,a)=0 ?

November 29th, 2013, 07:33 AM  #3  
Senior Member Joined: Oct 2010 From: Changchun, China Posts: 492 Thanks: 14  Re: can't understand the proof of "Interchange of integratio Quote:
(by NewtonLeibniz formula), thus .  
November 29th, 2013, 04:20 PM  #4  
Newbie Joined: Nov 2013 Posts: 9 Thanks: 0  Re: can't understand the proof of "Interchange of integratio Quote:
 
November 29th, 2013, 06:02 PM  #5 
Senior Member Joined: Oct 2010 From: Changchun, China Posts: 492 Thanks: 14  Re: can't understand the proof of "Interchange of integratio
The second equality holds because he has already said that: , 

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