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Re: a complex function appears in a real integration


Shaofeng Bian wrote:


> Hopefully, colleagues who have such experiences can give me some tips
> and a definite answer.

There is only one definite answer at place here. Be very (really very) 
careful with any result of Integrate, especially if you do a definite 
integral. If there are functions involved with branch cuts (in the 
integrand as well as in the result) it is quite probable that Mathematica 
puts it on the wrong sheet of the Riemann plane. One day I supported this 
to Wolfram Research as a bug. They never could convince me that it is a 
feature ;-).

-- 
Hendrik van Hees                        Fakultät für Physik 
Phone: +49 521/106-6221                 Universität Bielefeld 
Fax:   +49 521/106-2961                 Universitätsstraße 
mailto:hees at physik.uni-bielefeld.de     D-33615 Bielefeld 


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