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another Bug in Reduce ?

• To: mathgroup at smc.vnet.net
• Subject: [mg60487] another Bug in Reduce ?
• From: Peter Pein <petsie at dordos.net>
• Date: Sun, 18 Sep 2005 01:15:45 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

Dear group,

in message <dba4l5$elr$1 at smc.vnet.net> (07/16 2005), Mukhtar Bekkali
described a problem which involved Root[.] in dependance of a parameter.

This revealed another difference in the Reduce algorithms of versions
5.1 and 5.2.

Please have a look at
http://people.freenet.de/Peter_Berlin/Mathe/ReduceBug/ReduceBug.nb or
http://people.freenet.de/Peter_Berlin/Mathe/ReduceBug/ReduceBug.html.

In this case, version 5.1 did the better Job (and faster too).

Peter

P.S. the strange looking test for the root being real became necessary,
because Im[#]==0& did not work. (?)

-- 
Peter Pein, Berlin
GnuPG Key ID: 0xA34C5A82
http://people.freenet.de/Peter_Berlin/