Maybe I am just being stupid, but I don't understand why in the Laplace inversion formula(adsbygoogle = window.adsbygoogle || []).push({});

[tex](\mathcal{L}^{-1} F)(t) = \frac{1}{2\pi i} \int_{\sigma-i\infty}^{\sigma+i\infty} e^{st} F(s) ds[/tex]

the contour of integration must be chosen so that [itex]\sigma[/itex] is greater than the real part of all singularities of [itex]F(s)[/itex]. I would be very grateful if someone could explain this.

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# Laplace inversion

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