Re: Separating real part and imaginary part from each

• To: mathgroup at smc.vnet.net
• Subject: [mg101380] Re: Separating real part and imaginary part from each
• From: "Rommel.ua" <rommel.ua at gmail.com>
• Date: Sat, 4 Jul 2009 06:42:11 -0400 (EDT)
• References: <h24r0t\$rn7\$1@smc.vnet.net> <h27fiv\$cq5\$1@smc.vnet.net>

```On 28 =C9=C0=CE, 13:10, Alexander Erlich <alexander.erl... at gmail.com> wrote=
:
> Hi,
>
> thanks for the replies, ComplexExpand did the job! I don't know why I
> hadn't been familiar with it - I am reading Kofler's book (he's a very
> well known computer books author in Germany) which introduced
> Simplify, FullSimplify, Together, Apart, Expand, etc., but I didn't
> stumble over ComplexExpand yet.
>
> Question: What exactly does the line
>
> FullSimplify[ComplexExpand[#]] & /@ (Re[g] + I*Im[g])
>
> do? I guess it uses ComplexExpand to bring the expression to the form
> Re[g] + I*Im[g] and then fully simplifies (keeping this form), but
> it's only a guess. What does it really do?
>
> Thanks a lot to you!
>
> Alexander

FullSimplify simplifies expression obtained from ComplexExpand. The
tags  "& /@ (Re[g] + I*Im[g])" inform the mathematica kernel that
result must be in form a+i*b.

```

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