Re: eulerphi(0)

Kevin Buzzard on Thu, 14 Sep 2017 21:56:21 +0200

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Re: eulerphi(0)

To: Max Alekseyev <maxale@gmail.com>
Subject: Re: eulerphi(0)
From: Kevin Buzzard <k.buzzard@imperial.ac.uk>
Date: Thu, 14 Sep 2017 20:55:44 +0100
Cc: "pari-users@pari.math.u-bordeaux.fr" <pari-users@pari.math.u-bordeaux.fr>
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The number of units in Z/(0) is 2 ;-)

Kevin

On 14 September 2017 at 20:46, Max Alekseyev <maxale@gmail.com> wrote:
> Is there any particular reason behind eulerphi(0) = 2 ?
>
> ? eulerphi(0)
> %1 = 2
>
> I'd rather expect eulerphi(0) to result in an error.
> Zero value would also make more sense, since there are no positive integers
> <=0 (even if we do not care about co-primality).
>
> Regards,
> Max

References:
- eulerphi(0)
  - From: Max Alekseyev <maxale@gmail.com>

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