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Solve bug !!


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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