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MathGroup Archive 2005

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Re: Re: A bug in Integrate ?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg56401] Re: [mg56391] Re: A bug in Integrate ?
  • From: "Stepan Yakovenko" <yakovenko-mg at ngs.ru>
  • Date: Sun, 24 Apr 2005 03:28:51 -0400 (EDT)
  • References: <d4ak8d$io0$1@smc.vnet.net> <200504230516.BAA03167@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

On Sat, 23 Apr 2005 01:16:34 -0400 (EDT)
  "Scout" <user at domain.com> wrote:
> There is no bug at all!
> 
> Integrate[Exp[-x]UnitStep[-x], {x, a, Infinity}]
> and
> -Integrate[Exp[-x]UnitStep[-x], {x, Infinity, a}]
> 
> return the same result:    (-1+E^-a) UnitStep[-a]
> ..

I've just tried that on Mathematica 4 and in gave the same 
result. But Mathematica 5 says that the second integral 
doesn't converge. There, that's that. By the way, what's 
your version of Mathematica ?


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