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MathGroup Archive 2001

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Solve bug !!

  • To: mathgroup at smc.vnet.net
  • Subject: [mg31196] Solve bug !!
  • From: "Marcel" <arzo at exp.uji.es>
  • Date: Wed, 17 Oct 2001 05:35:18 -0400 (EDT)
  • Organization: Universitat Jaume I
  • Sender: owner-wri-mathgroup at wolfram.com

Where is the minus sign whe must obtain in the second case??

> Solve[(E^c)^2 - A*E^c + 1 == 0, c]

{{c -> Log[(1/2)*(A - Sqrt[-4 + A^2])]},
  {c -> Log[(1/2)*(A + Sqrt[-4 + A^2])]}}

> Solve[(E^(-c))^2 - A*E^(-c) + 1 == 0, c]

{{c -> Log[(1/2)*(A - Sqrt[-4 + A^2])]},
  {c -> Log[(1/2)*(A + Sqrt[-4 + A^2])]}}


Mathematica 4.1, Windows 2000 SP2, PII400.

Marcel Aguilella




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