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MathGroup Archive 2005

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Re: A bug in Integrate ?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg56391] Re: A bug in Integrate ?
  • From: "Scout" <user at domain.com>
  • Date: Sat, 23 Apr 2005 01:16:34 -0400 (EDT)
  • References: <d4ak8d$io0$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

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]
..

        ~Scout~

"Stepan Yakovenko" <yakovenko-mg at ngs.ru> ha scritto nel messaggio 
news:d4ak8d$io0$1 at smc.vnet.net...
> Hello !
>
> Strange, but
>
> Integrate[Exp[-x]UnitStep[-x], {x, a, Infinity}]
>
> calculates integral right, but
>
> -Integrate[Exp[-x]UnitStep[-x], {x, Infinity, a}]
>
> says that it doesn't converge.
>
> Can anyone comment this ?
>
> Thanx.
> 


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