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Re: simplify Arg[E^(I x)]?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg125754] Re: simplify Arg[E^(I x)]?
  • From: Bob Hanlon <hanlonr357 at gmail.com>
  • Date: Sun, 1 Apr 2012 03:34:24 -0400 (EDT)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com
  • References: <201203310842.DAA12986@smc.vnet.net>

Because it is only correct for a small domain

Plot[Arg[E^(I x)], {x, -2 Pi, 2 Pi}]

Arg[E^(I x)] /. {{x -> -Pi}, {x -> Pi}}

{Pi, Pi}

FullSimplify[Arg[E^(I x)], -Pi < x <= Pi]

x


Bob Hanlon

On Sat, Mar 31, 2012 at 4:42 AM, Neal Becker <ndbecker2 at gmail.com> wrote:
> Why doesn't this simplify?
>
> Fullsimplify[Arg[E^(I x)], x \[Element] Reals]
>
> I expect to get 'x'.
>
> Is there some way I can get this to simplify?
>



-- 
Bob Hanlon



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