       Re: Working modulo 2

• To: mathgroup at smc.vnet.net
• Subject: [mg92100] Re: Working modulo 2
• From: amzoti <amzoti at gmail.com>
• Date: Sat, 20 Sep 2008 04:57:40 -0400 (EDT)
• References: <gavt0g\$g4u\$1@smc.vnet.net>

```On Sep 19, 2:56 am, me13013 <me13... at gmail.com> wrote:
> Howdy,
>
> How does one reduce a polynomial's coefficients modulo 2?  For
> example, I have a function that sums several polynomials, and
> currently produces a result like this:
>   7 + x + 4 y + 4 x y + 3 z + 2 x z + 4 y z + 4 x y z
> I want to reduce this to
>   1 + x + z
>
> I thought I might be able to do this by somehow coercing the terms
> into a list and then doing Sum[L[[i]],{i,1,Length[L]},Modulus->2], but
> no such luck.
>
> Any ideas?
>
> Thanks,
> Bob H

PolynomialMod[7 + x + 4 y + 4 x y + 3 z + 2 x z + 4 y z + 4 x y z, 2]

1 + x + z

```

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