Re: Simplifying radicals
- To: mathgroup at smc.vnet.net
- Subject: [mg122224] Re: Simplifying radicals
- From: Alexei Boulbitch <Alexei.Boulbitch at iee.lu>
- Date: Fri, 21 Oct 2011 06:24:48 -0400 (EDT)
- Delivered-to: l-mathgroup@mail-archive0.wolfram.com
Hi, Tom, There had been a package RealOnly in the past (i.e. before M6) for this purpose, and I am curious what replaces it now. In between may be this: rule=(-1)1/3(r)1; (-729)^(1/3)/.rule can help. Best, Alexei Hi, I'm working with some introductory topics in radicals. I know that Mathematica assumes things about the domain used in problems, so the principal cube root of a negative number will be complex... or something like that.. I'm way down at the lower high school level simply working with cube roots of negative numbers and wanting a negative number result. I know there are ways of using assumptions and solving over the reals, etc. Is there any EASY way I can simply ask for the cube root of -729 and get -9? TOM Alexei BOULBITCH, Dr., habil. IEE S.A. ZAE Weiergewan, 11, rue Edmond Reuter, L-5326 Contern, LUXEMBOURG Office phone : +352-2454-2566 Office fax: +352-2454-3566 mobile phone: +49 151 52 40 66 44 e-mail: alexei.boulbitch at iee.lu<mailto:alexei.boulbitch at iee.lu>