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Interval[{a,b}]-Interval[{a,b}] = 0?

• To: mathgroup at smc.vnet.net
• Subject: [mg66613] Interval[{a,b}]-Interval[{a,b}] = 0?
• From: "Richard Fateman" <fateman at cs.berkeley.edu>
• Date: Wed, 24 May 2006 03:01:49 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

Is this a bug or a feature?
Notice that Interval[{-1,1}]-Interval[{-1,1}] is Interval[{-2,2}].

(I'm using Mathematica 5.1)

RJF

• Follow-Ups:
  • Re: Interval[{a,b}]-Interval[{a,b}] = 0?
    • From: Daniel Lichtblau <danl@wolfram.com>
  • Re: Interval[{a,b}]-Interval[{a,b}] = 0?
    • From: Sseziwa Mukasa <mukasa@jeol.com>
  • Re: Interval[{a,b}]-Interval[{a,b}] = 0?
    • From: Andrzej Kozlowski <akoz@mimuw.edu.pl>