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MathGroup Archive 2006

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Re: Why does this lead to an answer with complex numbers?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg71464] Re: Why does this lead to an answer with complex numbers?
  • From: aaronfude at gmail.com
  • Date: Mon, 20 Nov 2006 02:43:44 -0500 (EST)
  • References: <ejosmm$n3k$1@smc.vnet.net>

Hi,

Thanks for all the answers. They were all very useful, even though I
have done my best to confuse everyone by leaving a beta in there which
had nothing to do with the problem.

So I understand that the answer may be complex and the complex part is
constant which is in a certain sense valid for a indefinite integral.
But I very much need a real answer and I still can't quite extract.
Consider the following:

\!\(\(\(\ \)\(Assuming[x > 0 && A > 0 && B > 0 && \ B < 1, \
    FullSimplify[Integrate[Log[\@\(A^2 + x\^2\) - B*x\ ], \ x]]]\)\)\)

The answer that I get is correct, but not very useful since it is
appears complex and I could find a way to determine the real part. Do
you have any suggestions?


Thank you!

Aaron Fude


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