String negative indices?

[Erik Max Francis]

Steven D'Aprano wrote:

>> Steven D'Aprano wrote:
>>
>>> In matrix maths, there are an infinite number of
>>> different matrices where all the elements are zero -- they are all
>>> distinct, different, zeroes.
>
>> What do you even mean by that?  By "matrix maths," do you just mean 
>> matrices whose elements are reals, or something else?
> 
> Given any matrix M, there is a matrix Z such that M+Z = M. That matrix Z
> is equivalent to zero in the reals, where x+0 = x.

Ah, of course.  I knew this, I just misinterpreted your "distinct, 
different, zeroes" as referring to the elements but not the matrices. 
Just a misunderstanding.

Every zero matrix is an additive identity, and there are an infinite 
number of them.  That's certainly true.

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