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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: [mg60222] Re: Strange "not a symbol or valid symbol name" error
  • From: "Jens-Peer Kuska" <kuska at informatik.uni-leipzig.de>
  • Date: Thu, 8 Sep 2005 04:52:59 -0400 (EDT)
  • Organization: Uni Leipzig
  • References: <dfm86d$hek$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

try
x=.;
Integrate[E^(-x) Sqrt[x^2-9], {x,3,5}]

but Mathematica can't do the integral.
Regards
  Jens


"Flip" <fliptomato at gmail.com> schrieb im 
Newsbeitrag news:dfm86d$hek$1 at smc.vnet.net...
| 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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