Re: DiracDelta Function question
- To: mathgroup at smc.vnet.net
- Subject: [mg21104] Re: [mg21082] DiracDelta Function question
- From: BobHanlon at aol.com
- Date: Fri, 17 Dec 1999 01:21:04 -0500 (EST)
- Sender: owner-wri-mathgroup at wolfram.com
I get the same results on a Mac with version 4.
Further, this is just an instance of a more general problem:
Integrate[DiracDelta[a x + b], {x, -Infinity, +Infinity}]
1/Abs[a]
Bob Hanlon
In a message dated 12/13/1999 1:21:22 AM, acz43 at dial.pipex.com writes:
>Why is mathematica unable to evaluate:
>Integrate[DiracDelta[2 x - 1], {x, -Infinity, +Infinity}]
>
>Also interestingly:
>Integrate[DiracDelta[2 x - 2], {x, -Infinity, +Infinity}]
>
>returns (1/2)
>
>I should have thought that the answer in both cases would be 1.
>
>I am using Mathematica v4.0 on MS Windows 95.
>