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I've been having some problems trying to re-arrange this equation for a few days now, the problem is that sigma(s) appears twice in the equation: http://screencast.com/t/dlDwH4eIcp [Broken]

The problem seems to be that I always end up with complex roots rather than a single equation for sigma(s).

Note the exponential should not be under the square root.

Thank you :)

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# Can't re-arrange equation

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