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Re: Thx for your help

• To: mathgroup at smc.vnet.net
• Subject: [mg23743] Re: Thx for your help
• From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
• Date: Mon, 5 Jun 2000 01:09:36 -0400 (EDT)
• Organization: Universitaet Leipzig
• References: <8gv8ji$5nf@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

Hi, since Mathematica don't know that

x^n*DiracDelta[x]== 0 /; n>0

it can't find that Integrate[Abs[x],x]-> x^2*Sign[x]/2

As book advice *not* a Mathematica book, a mathematics book
seems to be more use full.

Regards
  Jens

Jos\151 Mar\155a Lasso wrote:
>
> Hi,
> Thx for the answers to my last post, but I have a new question, similar to
> the last one, when I try: Integrate[Abs[x],x], there is no result, just the
> original input, what I am doing wrong?, I need some advice about a good
> book about Mathematica for beginers.Thx again.Best regards
>
> Jose M Lasso