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Re: Bug: symbol recreates itself suddenly

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  • Subject: [mg86827] Re: Bug: symbol recreates itself suddenly
  • From: Szabolcs Horvát <szhorvat at>
  • Date: Sat, 22 Mar 2008 00:54:20 -0500 (EST)
  • Organization: University of Bergen
  • References: <9457525.1205860522819.JavaMail.root@m08> <frqpu5$59m$> <frvmbc$i50$>

Severin Posta wrote:
> This is definitely NOT the correct answer. The correct answer is (should be)
> "Symbol E not found."
> By all means this is really a bug.
> It has far-reaching consequences.

Yes, for example doing this will break your Mathematica.

> Using symbol E afterwards can lead to 
> mistakes because Mathematica thinks (suddenly!) this is again Euler 
> constant, not general symbol.

Did you expect that breaking hundreds of functions by removing E would 
not lead to mistakes?

> Please don't ask why am I doing this. This is not forbidden according to 
> manual - and it worked in 4.0, 5.0, 5.2 versions. It should work in 6.0 
> either. (Or it should be documented.)

No, it does not work in v5.2 either.  Mathematica loads symbols on 
demand (see DeclarePackage), and you will find a command in any version 
that triggers loading a function that uses E.

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