[cfp-interest 3744] Re: division of a real by a complex

Jim Thomas jaswthomas at sbcglobal.net
Fri Dec 12 17:10:49 PST 2025


Hi Paul,

C2Y (https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3685.pdf) addresses this in 6.5.6 paragraph 9.

- Jim Thomas

> On Dec 12, 2025, at 3:08 AM, Paul Zimmermann <Paul.Zimmermann at inria.fr> wrote:
> 
>       Hi,
> 
> we had this question on the GNU MPC list: how should the division of a
> real number by a complex number be defined? In particular (-1)/(+0 + 1*i)?
> 
> See the thread starting at
> https://sympa.inria.fr/sympa/arc/mpc-discuss/2025-12/msg00000.html
> 
> In GNU MPC, we convert the real number to a complex number with a +0
> imaginary part, and then call complex division.
> 
> Is there any other definition that makes more sense?
> 
> Paul
> 
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