Re: Why is this so?

• To: mathgroup at smc.vnet.net
• Subject: [mg15334] Re: Why is this so?
• From: phbrf at t-online.de (Peter Breitfeld)
• Date: Fri, 8 Jan 1999 04:15:22 -0500
• Organization: das ist ein breites Feld ...
• References: <76pq9g\$e0n@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

```Chester Lin <chester at nicco.sscnet.ucla.edu> schrieb:
> The following in/out does not make sense to me:
>
> Clear[f, x]
> f[x_] := x^(1/3)
> Plot[f[x], {x, -125, 125}]
>
>
> Isn't it true that (-125)^(1/3) == -5?
>
> Why do I get this strange result?
>
> I am using Mathematica 3.01 for Students on Macintosh.

Mathematica take the principal branch of root, so (-125)^(1/3) is
evaluated to 5/2 + 5 I Sqrt[3])/2

Es gruesst
Peter
--
=--=--=--=--=--=--=--=--=--=--=--=--=--=--=--=--=--=--=--=--=--=--=--=
P e t e r  B r e i t f e l d              eMail: phbrf at t-online.de
Kreuzgasse 4, 88348 Saulgau, Germany      PGP public key: 08548045
=--=--=--=--=--=--=--=--=--=--=--=--=--=--=--=--=--=--=--=--=--=--=--=

```

• Prev by Date: Re: Why is this so?
• Next by Date: Re: Why is this so?
• Previous by thread: Re: Why is this so?
• Next by thread: Re: Why is this so?