MathGroup Archive: January 2006 [00500]

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

To: mathgroup at smc.vnet.net
Subject: [mg63945] Assuming to be a real number is useless even in simple cases?
From: Roberto <roberto at pop.it>
Date: Tue, 24 Jan 2006 01:30:31 -0500 (EST)
Sender: owner-wri-mathgroup at wolfram.com

In[1]:=
Assuming[x\[Element]Reals, Im[x]]

Out[1]=
Im[x]

Why it's not zero?

Follow-Ups:
- Re: Assuming to be a real number is useless even in simple cases?
  - From: Andrzej Kozlowski <akoz@mimuw.edu.pl>
- Re: Assuming to be a real number is useless even in simple cases?
  - From: <bsyehuda@gmail.com>

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