Thank you very much! I couldn't understand what 
I was doing wrong for the life of me, now it's clear.


On Monday, May 6, 2013 2:05:56 AM UTC-3, Simon King wrote:
>
> Hi, 
>
> On 2013-05-05, William Stein <wst...@gmail.com <javascript:>> wrote: 
> >> F =3D GF(3) 
> >> R.<x> =3D F[] 
> >> T(x)=3D5*x^2+3 
> > 
> > This is wrong.  Do T=3D5*x^2+3 instead. 
>
> To elaborate a bit more: 
>
> By 
>   T(x) = 3*x^2+3 
> you define T as a symbolic function (not as a polynomial) in the 
> new symbolic variable x. Hence, after this line, x is a symbolic 
> variable and not the generator of a polynomial ring. 
>
> Best regards, 
> Simon 
>
>
>

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