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

[Emanuel Berg]

Jean Louis wrote:

>> In Lisp, the `+' operator returns the sum of the additive
>> identity with all of its arguments. The additive identity
>> equals zero and you provided zero arguments. Hence, you get
>> the additive identity.
>
> Send me references on what is additive identity.

https://en.wikipedia.org/wiki/Identity_element

> Though that it is so, it does not answer why is it so.

So that a + 0 = a

And for multiplication 1a = a so there, the identity element
is 1.

There is also an identity matrix and so on.

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