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Are some equations unsolvable?

• To: mathgroup at smc.vnet.net
• Subject: [mg128061] Are some equations unsolvable?
• From: Sergio Sergio <zerge69 at gmail.com>
• Date: Wed, 12 Sep 2012 03:00:44 -0400 (EDT)
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• Delivered-to: l-mathgroup@wolfram.com
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Hi,
This is what I have:

f = (1/(sigma*Sqrt[2 Pi]))*Sqrt[(Pi/(-1/(2*sigma^2)))]*
  Exp[((m/sigma^2)^2)/4*(-1/2*sigma^2) + (m^2/(2*sigma^2))]

Solve[f == 216, sigma]

And I get this message: "This system cannot be solved with the methods available to Solve" 

Is it because there is no way to isolate sigma? Or am I doing something wrong?

Thanks

• Follow-Ups:
  • Re: Are some equations unsolvable?
    • From: Bob Hanlon <hanlonr357@gmail.com>