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MathGroup Archive 1995

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Re: 2 questions about simplifications of expressions in MMA

  • To: mathgroup at christensen.cybernetics.net
  • Subject: [mg437] Re: [mg423] 2 questions about simplifications of expressions in MMA
  • From: Lou Talman <me at talmanl.mscd.edu>
  • Date: Mon, 30 Jan 95 08:48:56 -0700

On 29 Jan. 95, Fedor G. Pikus wrote:

> First of all, how do I make MMA understand that  this
> 

>                                  2
>               e1 - Sqrt[(e1 - e2) ] - e2      

> Out[12]= {----------------------------------- }
>                                    2       2
>           Sqrt[(e1 - Sqrt[(e1 - e2) ] - e2) ]
> 

> is really 1.

In point of fact, Mathematica is correct in not reducing this expression  
to 1.  When e1 is greater than or equal to e2, the expression is  
undefined; when e1 is less than e2, the expression reduces to -1.

--Lou Talman
  Metropolitan State College of Denver


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