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MathGroup Archive 2007

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Re: Weird result in Mathematica 6

  • To: mathgroup at smc.vnet.net
  • Subject: [mg76603] Re: Weird result in Mathematica 6
  • From: Sebastian Meznaric <meznaric at gmail.com>
  • Date: Thu, 24 May 2007 06:18:15 -0400 (EDT)
  • References: <200705211001.GAA10071@smc.vnet.net>

Another related effect can be used to actually derive contradictions
in Mathematica. Try this
Simplify[Im[x],Assumptions->{x-Conjugate[x]>0}]

It returns 0. The assumption was that Im[x]>0 so here Mathematica
clearly contradicts the assumption.

Obviously this suggests one should be very careful when using
inequalities with complex quantities. I think this sort of bugs should
really be fixed considering how much trouble Mathematica usually goes
into to ensure that real quantities are not assumed in expressions.



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