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MathGroup Archive 2005

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Re: Strange "not a symbol or valid symbol name" error

  • To: mathgroup at smc.vnet.net
  • Subject: [mg60238] Re: Strange "not a symbol or valid symbol name" error
  • From: "Kevin J. McCann" <kmccann at umbc.edu>
  • Date: Thu, 8 Sep 2005 04:53:19 -0400 (EDT)
  • Organization: University of Maryland, Baltimore County
  • References: <dfm86d$hek$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

I tried this and Mathematica does not find a closed form answer, but will do it 
numerically. I am not sure about your error, unless you have defined x 
previously. Try x=. before you integrate to see if this is the problem.

Kevin

Flip wrote:

> Greetings all, I'm using Mathematica 5.0 and have been getting a
> strange error message:
> 
> Unique::usym :
> 10000000000 is not a symbol or a valid symbol name
> 
> This comes from the following integral:
> 
> Integrate[E^(-x) Sqrt[x^2-9], {x,3,5}]
> 
> The limits of integration don't matter much so long as they keep the
> integrand real.
> 
> I don't understand this and am not quite sure how to fix the problem.
> (It's a well defined definite integral, right? It's real in the domain
> of integration and nondivergent.)
> 
> Thanks,
> Flip
> 


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