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Re: Bug: symbol recreates itself suddenly

• To: mathgroup at smc.vnet.net
• Subject: [mg86882] Re: Bug: symbol recreates itself suddenly
• From: Bhuvanesh <lalu_bhatt at yahoo.com>
• Date: Tue, 25 Mar 2008 01:15:26 -0500 (EST)

There are some things that are not forbidden by the manual, but still, doing them might be a bad idea. For example, making definitions such as the following isn't a good idea:

Sign[x]^=1;

Instead one should use the assumptions mechanism:

$Assumptions = Re[x] > 0 && Im[x] == 0;

I agree that the documentation could be improved for such cases.

Bhuvanesh,
Wolfram Research