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Re: Assuming to be a real number is useless even in simple cases?

• To: mathgroup at smc.vnet.net
• Subject: [mg63959] Re: [mg63945] Assuming to be a real number is useless even in simple cases?
• From: <bsyehuda at gmail.com>
• Date: Wed, 25 Jan 2006 08:45:44 -0500 (EST)
• References: <200601240630.BAA23642@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

Hi,
It seems that Im[] is not using this specific assumption for simplification.
However you can use
Refine[Im[x], Assumptions -> x \[Element] Reals]
or
Simplify[Im[x], Assumptions -> x \[Element] Reals]
to achieve this
yehuda

On 1/24/06, Roberto <roberto at pop.it> wrote:
>
> In[1]:=
> Assuming[x\[Element]Reals, Im[x]]
>
> Out[1]=
> Im[x]
>
> Why it's not zero?
>
>

• References:
  • Assuming to be a real number is useless even in simple cases?
    • From: Roberto <roberto@pop.it>