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Topic: How to use Mathematica find the solution of an
Replies: 5   Last Post: May 28, 2013 3:49 AM

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Bob Hanlon

Posts: 906
Registered: 10/29/11
Re: How to use Mathematica find the solution of an
Posted: May 24, 2013 5:25 AM
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The equation does not appear to have a solution except as a limit (from
below) but then the solution is either -1 or 1.

eqn = Arg[-(I/((1 + I w)^2 w))] == -Pi;

eqn // Simplify


eqn /. {{w -> -1}, {w -> 1}}

{False, False}

Limit[Arg[-(I/((1 + I w)^2 w))],
w -> -1, Direction -> 1] == -Pi


Limit[Arg[-(I/((1 + I w)^2 w))],
w -> 1, Direction -> 1] == -Pi


Bob Hanlon

On Thu, May 23, 2013 at 4:04 AM, Eduardo M. A. M. Mendes <> wrote:

> Hello
> I need to solve the following equation:
> Arg[-(I/((1+I \[Omega])^2 \[Omega]))]==-\[Pi]
> I have tried Solve (empty output), Reduce (it gives some results but not
> the answer Omega=1) and FindRoot (it gives Omega=1 but it is a
> numerical search). Is there a way to get the solution not using a
> numerical search?
> Many thanks
> Ed
> PS. I need to solve several equation of the same kind.

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