Re: [External] : Re: How to make M-x TAB not work on (interactive) declaration?

[Yuri Khan]

On Mon, 16 Jan 2023 at 17:17, Jean Louis <bugs@gnu.support> wrote:

> (*) ➜ 1
> (+) ➜ 0
> (/) Wrong number of arguments: /
> (-) ➜ 0
>
> The question why is not yet clear to me. Why is it in Lisp so?

Subtraction and division are not monoid operations. As such, they do
not have an associated identity value.

They also choose to handle the single argument case specially: (- x)
is equivalent to (- 0 x) and (/ x) is equivalent to (/ 1 x).

Making (/) return the multiplicative identity would be consistent though.