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