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MathGroup Archive 2003

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Re: A question on interval arithmetic

  • To: mathgroup at smc.vnet.net
  • Subject: [mg43751] Re: A question on interval arithmetic
  • From: Matthias <no at spam.pls>
  • Date: Fri, 3 Oct 2003 02:28:40 -0400 (EDT)
  • Organization: Rechenzentrum Uni-Mannheim
  • References: <blcq5l$p5f$1@smc.vnet.net> <blgjd7$hs5$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Olaf Rogalsky <olaf.rogalsky at theorie1.physik.uni-erlangen.de> writes:

> In[1]:= r1*r2/(r1+r2) /. {r1 -> Interval[{min1,max1}], r2 -> Interval[{min2,max2}]}
> In[2]:= FullSimplify[%]
> In[3]:= % /. {min1 -> 10, max1 -> 20, min2 -> 20, max2 -> 40}
> Out[4]:= Interval[{20/3, 40/3}]

Here is an example where applying FullSimplify to an expression
actually changes its value.  Isn't this a bug?


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