Re: positive square root

*To*: mathgroup at smc.vnet.net*Subject*: [mg58693] Re: positive square root*From*: "Jens-Peer Kuska" <kuska at informatik.uni-leipzig.de>*Date*: Fri, 15 Jul 2005 03:02:09 -0400 (EDT)*Organization*: Uni Leipzig*References*: <db57ne$4no$1@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

Hi, *you* live in a "world where the square root is always a positive number" ? and you can't escape ? And what is Sqrt[-1] in your world ? For real positive arguments Mathematica will compute real positve square roots, just say Simplify[] and FullSimplify[] that your arguments are real and positive ? Regards Jens "paulvonhippel at yahoo" <paulvonhippel at yahoo.com> schrieb im Newsbeitrag news:db57ne$4no$1 at smc.vnet.net... |I work in a world where the square root is always a positive number. | But Mathematica allows for the possibility of negative square roots. | Two questions arise: | | (1) Is there a way to tell Mathematica that I'm only interested in | positive square roots? | | (2) My current solution is to use, e.g., Abs[Sqrt[z]]. But when | Mathematica echoes this, it puts the Abs function *under* the radical, | so it looks like Sqrt[Abs[z]]. Is this a bug in the display? |