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Re: Have I found a bug?

• To: mathgroup at smc.vnet.net
• Subject: [mg84244] Re: Have I found a bug?
• From: David Reiss <dbreiss at gmail.com>
• Date: Sat, 15 Dec 2007 15:37:25 -0500 (EST)
• References: <fjtgdu$7hm$1@smc.vnet.net> <fjtrcu$ctd$1@smc.vnet.net>

Remember (!) that indefinite integration is only unique up to an
additive constant.

Mathematica does not supply this additive constant but you can include
it as a parameter.

I hope that this helps...
-David
A WorkLife FrameWork
E x t e n d i n g MATHEMATICA's Reach...
http://scientificarts.com/worklife/



On Dec 14, 3:02 pm, Louise Hoffman <louise.hoff... at gmail.com> wrote:
> > both are correct.
>
> > To check, one must get the original function by taking the derivative of
>
> >   Log[- answer]
>
> > answer2= answer1 Sqrt[-1] = I answer1.
>
> > Log[-answer2] = Log[- I answer1]= Log[I]+ Log[-answer1]
>
> > The additional summand Log[I] is eliminated by the derivative.
>
> Is it possible to have Mathematica to give both answers?
>
> Thanks for the great reply =)
>
> Hugs,
> Louise