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MathGroup Archive 2005

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Re: Re: A bug in Integrate ?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg56434] Re: Re: A bug in Integrate ?
  • From: "Scout" <user at domain.com>
  • Date: Mon, 25 Apr 2005 01:30:49 -0400 (EDT)
  • References: <d4ak8d$io0$1@smc.vnet.net> <200504230516.BAA03167@smc.vnet.net> <d4fi4d$fs1$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

As you have properly tried, I'm using version 4.
I don't know why ver.5 reports that answer  :-o
Bye.

    ~Scout~

"Stepan Yakovenko" <yakovenko-mg at ngs.ru> ha scritto nel messaggio 
news:d4fi4d$fs1$1 at smc.vnet.net...
> 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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