Bill Allombert on Fri, 31 Jan 2003 15:06:58 +0100 |
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Re: ffinit |
On Fri, Jan 31, 2003 at 02:00:06PM +0000, Cherry Kearton wrote: > I want to work with finite fields, and in the PARI manual it says that > ffinit is designed for this. Specifically it says "For instance if P = > ffinit(3,2,y), you can represent elements in F3 2 as polmods modulo P." > But if one sets > a=Mod(1,P) > then > a+a+a=Mod(3,P), > whereas I would expect Mod(0,P). > > How is one supposed to deal with finite fields under GP? You need to write a=Mod(Mod(1,3),P) ? a+a+a %9 = Mod(Mod(0, 3), Mod(1, 3)*y^2 + Mod(1, 3)) I agree it is a bit ugly. Cheers, Bill.