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Contour integration [duplicate]

Possible Duplicate: Symbolic integration in the complex plane Does mathematica do Contour integration ? like this one : $\displaystyle \oint_{\gamma} f(z)\ \mathrm{d}z $ if yes, how ...
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votes
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Is it possible to set a variable as a positive one in the whole notebook?

I'm having issues during integration due to the fact that Mathematica doesn't know if an undefined variable is positive or not (it gives me complexes which bothers me in the end). For example I do ...