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Question: How do I solve an integral with some numerical parameters

Question:How do I solve an integral with some numerical parameters

kushla 12 Maple
assign complex format
May 21 2010
0

I have a parameter r which is between a and R, a less then r, r less then R - real or complex numbers, whatever, I need to integrate following function:

1/4*Pi*int(dr1/|r-r1|*int(dr2/|r-r2|*int(dr3/|r-r3|,r3=a..R),r2=a..R),r1=a..R);

The problem is that Maple always says, that it's unable to determine if r is between a and R, how can I assign r into this interval?

[note: Axel Vogt, 20 May: formatted the posting, such that it is readable]
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