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MathGroup Archive 2005

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Re: A Problem with Integrate

  • To: mathgroup at
  • Subject: [mg61923] Re: [mg61895] A Problem with Integrate
  • From: "fizzy" <fizzycist at>
  • Date: Fri, 4 Nov 2005 05:12:05 -0500 (EST)
  • References: <>
  • Sender: owner-wri-mathgroup at

I tried this in 4.2 and get a result....whether its correct or not I dont 
know  but you get an output with Ei functions....I'd like to add that I have 
tried other integrals, primarily definite integrals, that work in  4.2 but 
not in 5.2 or rather at least give an output in 4.2........

Jerry Blimbaum

----- Original Message ----- 
From: "Kevin J. McCann" <kmccann at>
To: mathgroup at
Subject: [mg61923] [mg61895] A Problem with Integrate

> When I try the following indefinite integral:
> Integrate[1/(E^t*(t^3*(-1 + μ*t))), t]
> under 5.2, I get
> Power::infy : Infinite expression 1/0^2 encountered. More ...
> 0
> That is, it somehow gets 1/0^2, and returns an answer of zero. On the
> other hand, if I leave out the exponential and just integrate
> Integrate[1/(t^3*(-1 + t*μ)), t]
> It works just fine. A plot of the integrand and a numerical integration
> works, just the symbolic chokes.
> Any ideas would be appreciated.
> Thanks,
> Kevin

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