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MathGroup Archive 2007

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bug in Integrate

  • To: mathgroup at smc.vnet.net
  • Subject: [mg78114] bug in Integrate
  • From: Veit Elser <ve10 at cornell.edu>
  • Date: Sat, 23 Jun 2007 07:08:42 -0400 (EDT)

In version 6.0, the Integrate function applied to

Integrate[x Exp[-x] Log[x z], {x, 0, Infinity}, Assumptions -> z > 0]

evaluates to 0. Version 5.2 gives the correct result,

1 - EulerGamma + Log[z]. Interestingly, back in version 6.0

Integrate[x Exp[-x] Log[x z], {x, 0, Infinity}, Assumptions -> z == 1]

does evaluate correctly to

1 - EulerGamma

Let's hope this is fixed before the end of Euler's tercentennial.


Veit Elser


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