Re: Is this a bug ?

[Bill Allombert <Bill.Allombert@math.u-bordeaux1.fr>]

On Tue, Jan 29, 2013 at 03:14:24PM +0100, Ewan Delanoy wrote:
> GP/PARI CALCULATOR Version 2.5.3 (released)
>  i386 running darwin (x86-64/GMP-5.0.4 kernel) 64-bit version
>  compiled: Jan 24 2013, gcc-4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.11.00)
>  (readline v6.2 enabled, extended help enabled)
> 
>  Copyright (C) 2000-2011 The PARI Group
> 
>  PARI/GP is free software, covered by the GNU General Public License, and comes WITHOUT ANY
>  WARRANTY WHATSOEVER.
> 
>  Type ? for help, \q to quit.
>  Type ?12 for how to get moral (and possibly technical) support.
> 
>  parisize = 8000000, primelimit = 500509
>  ? 9%4
>  %1 = 1
>  ? polcoeff(8*a+9*b,1,b)
>  %2 = 9
>  ? (polcoeff(8*a+9*b,1,b))%4
>  %3 = 0

The same problem again. 8*a+9*b is a bivariate polynomial so its coefficient in b
is a polynomial in a, not an integer.

Cheers,
Bill.