MathGroup Archive 2009

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: Re: question related to (-1)^(1/3)

  • To: mathgroup at
  • Subject: [mg96765] Re: [mg96749] Re: question related to (-1)^(1/3)
  • From: Xiang Liu <liuxiang77 at>
  • Date: Tue, 24 Feb 2009 05:46:14 -0500 (EST)
  • References: <gnqo3c$c95$> <>

I just want to get the real solution of (-1)^(1/3).
BTW, I have read the tutorial but I am still confused with its explanation.
But that is not important, I just feel it is inconvenient for the following

RecurrenceTable[{x[n + 1] == -x[n]^(1/3), x[0] == 1},  x, {n, 1, 200}] // N

I consider there should be a way to limit the output in the domain real.
for example, in MAXIMA

(%i1) domain;
(%o1) real
(%i2) (-1)^(1/3);
(%o2) -1
(%i3) domain:complex;
(%o3) complex
(%i4) (-1)^(1/3),numer;
(%o4) 0.86602540378444*%i+0.5

On Mon, Feb 23, 2009 at 6:04 PM, Sjoerd C. de Vries <
sjoerd.c.devries at> wrote:

> This misunderstanding pops up over and over again in this group.
> Please type tutorial/FunctionsThatDoNotHaveUniqueValues in the search
> bar of the mathematica doc centre.
> Cheers -- Sjoerd

  • Prev by Date: Re: Symbolic matrix operations
  • Next by Date: Re: Expecting an image instead of image...
  • Previous by thread: Re: question related to (-1)^(1/3)
  • Next by thread: Re: Re: question related to (-1)^(1/3)