Re: [sympy] Re: Help: simple univariate polynomial, sympy solve gives no results

Oscar, you need to click on "more roots" in wolfram alpha to see the algebraic solution, which is definitely confusing. On Wednesday, January 20, 2016 at 3:55:37 AM UTC-6, Oscar wrote: > > On 20 January 2016 at 05:46, Denis Akhiyarov > wrote: > > On Tuesday, January 19,

Re: [sympy] Re: Help: simple univariate polynomial, sympy solve gives no results

On 20 January 2016 at 15:05, Denis Akhiyarov wrote: > > Oscar, you need to click on "more roots" in wolfram alpha to see the > algebraic solution, which is definitely confusing. Unless I'm misreading all of the additional roots are for the case where A=0. IOW Wolfram

Re: [sympy] Re: Help: simple univariate polynomial, sympy solve gives no results

On 20 January 2016 at 15:11, Aaron Meurer wrote: > SymPy has algorithms to find roots of quintics in radicals (when they > exist). I don't recall if the algorithms work for symbolic inputs. > > One can take a general quintic (x**5 + a*x**4 + b*x**3 + c*x**2 + d*x + e) > and

Re: [sympy] Re: Help: simple univariate polynomial, sympy solve gives no results

On Wed, Jan 20, 2016 at 10:30 AM, Oscar Benjamin wrote: > On 20 January 2016 at 15:11, Aaron Meurer wrote: > > SymPy has algorithms to find roots of quintics in radicals (when they > > exist). I don't recall if the algorithms work for symbolic

Re: [sympy] Re: Help: simple univariate polynomial, sympy solve gives no results

SymPy has algorithms to find roots of quintics in radicals (when they exist). I don't recall if the algorithms work for symbolic inputs. One can take a general quintic (x**5 + a*x**4 + b*x**3 + c*x**2 + d*x + e) and shift it by y (replace x with x - y). Then expand and collect terms in x. The

Re: [sympy] Re: Help: simple univariate polynomial, sympy solve gives no results

I missed A=0 on wolfram, sorry for confusion On Wed, Jan 20, 2016, 9:38 AM Aaron Meurer wrote: > On Wed, Jan 20, 2016 at 10:30 AM, Oscar Benjamin < > oscar.j.benja...@gmail.com> wrote: > >> On 20 January 2016 at 15:11, Aaron Meurer wrote: >> > SymPy has

Re: [sympy] Re: Help: simple univariate polynomial, sympy solve gives no results

WolframAlpha is solving for all five variables at once. The roots in radicals that it gives are when A = 0 (in which case, you have a quartic, which are solvable in radicals). Aaron Meurer On Wed, Jan 20, 2016 at 10:05 AM, Denis Akhiyarov wrote: > Oscar, you need to

[sympy] Re: Help: simple univariate polynomial, sympy solve gives no results

On Wednesday, January 20, 2016 at 4:37:18 AM UTC+2, Junwei Huang wrote: > > Hello, I am new to sympy and try to solve the following equation > > import sympy as sy > A,B,C,D,x=sy.var('A,B,C,D,x',positive=True) > sy.solve(A*x**5+B*x**4+C*x-D,x) > > but got no result. There are no roots, or I used

Re: [sympy] Re: Help: simple univariate polynomial, sympy solve gives no results

On 20 January 2016 at 05:46, Denis Akhiyarov wrote: > On Tuesday, January 19, 2016 at 11:41:47 PM UTC-6, Denis Akhiyarov wrote: >> >> no algebraic roots according to this theorem: >> https://en.wikipedia.org/wiki/Abel%E2%80%93Ruffini_theorem The theorem only shows that

[sympy] Re: Help: simple univariate polynomial, sympy solve gives no results

no algebraic roots according to this theorem: https://en.wikipedia.org/wiki/Abel%E2%80%93Ruffini_theorem On Tuesday, January 19, 2016 at 8:37:18 PM UTC-6, Junwei Huang wrote: > > Hello, I am new to sympy and try to solve the following equation > > import sympy as sy >

[sympy] Re: Help: simple univariate polynomial, sympy solve gives no results

actually this case looks like has some special properties and hence has some roots according to Wolfram: http://www.wolframalpha.com/input/?i=A*x%5E5%2BB*x%5E4%2BC*x-D%3D0 On Tuesday, January 19, 2016 at 11:41:47 PM UTC-6, Denis Akhiyarov wrote: > > no algebraic roots according to this theorem: