Karim Belabas on Tue, 29 Jan 2013 15:33:35 +0100


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Re: Is this a bug ? 

* Ewan Delanoy [2013-01-29 15:14]:
>  ? polcoeff(8*a+9*b,1,b)
>  %2 = 9
>  ? (polcoeff(8*a+9*b,1,b))%4
>  %3 = 0

The last division takes place in Q[a], in which 4 is invertible. You
probably want to do something like
  n = simplify( polcoeff(8*a+9*b,1,b) );
  n % 9

Cheers,

    K.B.
--
Karim Belabas, IMB (UMR 5251)  Tel: (+33) (0)5 40 00 26 17
Universite Bordeaux 1          Fax: (+33) (0)5 40 00 69 50
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