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 it in a wrong way? Thanks
>It seems that this polynomial equation is not solvable by radicals in general. A general quintic x**5 + a*x**4 + b*x**3 + c*x**2 + d*x + e can be transformed into the Bring-Jerrard normal form x**5 + d*x + e (https://en.wikipedia.org/wiki/Bring_radical#Bring.E2.80.93Jerrard_normal_form) which is solvable only under special conditions between its two coefficients. -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/f2dcd7a3-4097-4a3e-9c71-07bff5edff5f%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
