Re: refining expression in terms of real numbers
- To: mathgroup at smc.vnet.net
- Subject: [mg58837] Re: refining expression in terms of real numbers
- From: "Mukhtar Bekkali" <mbekkali at gmail.com>
- Date: Wed, 20 Jul 2005 00:29:38 -0400 (EDT)
- References: <dba4l5$elr$1@smc.vnet.net><dbd0ll$2pm$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Thanks Peter. This follow up question pertains to your remark regarding Mathematica changing the order of solutions. For example, in this code \!\(\(γ = 5\/7;\)\[IndentingNewLine] \(T = \(Root[243\ γ - 54\ λ + 432\ γ\ λ + 54\ γ\^2\ λ - 96\ λ\^2 + 108\ γ\ λ\^2 - 10\ λ\^3 - 243\ #1 - 540\ λ\ #1 - 324\ γ\ λ\ #1 - 252\ λ\^2\ #1 - 216\ γ\ λ\^2\ #1 - 24\ λ\^3\ #1 + 216\ λ\ #1\^2 + 216\ λ\^2\ #1\^2 + 72\ λ\^3\ #1\^2 \ + 48\ λ\^2\ #1\^3 + 32\ λ\^3\ #1\^3 &, #] &\) /@ Range[3];\)\ \[IndentingNewLine] \(TR := Refine[ToRadicals[T[\([i]\)]], {1\/2 � \ γ � \ 1 - λ\/4, 2 > λ > 0}];\)\[IndentingNewLine] \(Table[Plot[Evaluate[{TR, T[\([i]\)]}], {λ, 1\/2, 3\/2}, PlotStyle \[Rule] {Hue[0], Hue[ .7]}], {i, 1, 3}];\)\ \[IndentingNewLine] \) function TR looks nothing like T. Something weird is happening behind the scenes. Mukhtar Bekkali