The problem has certainly already be solved but I didn't find it in a short research.
Anyway I'm just asking for a check-result.
Prove that if and are matrices and is a one, then .
My attempt : By definition, so (call this 1) (call this 2) .
I'm not sure if I can pass from 1 to 2 as I did or I need more calculus/or explanation.
Hi guys,
There is a little problem with that. Just to be picky, but it looks important to me >.<
Let
etc...
It is clear (well in fact you gotta know the conventions) that the second coordinate of A_{ij} goes from 1 and m and not 1 and n.
So is rather
The first coordinate = # of the row.
The second coordinate = # of the column.
A matrix (n,m) is meant to have n rows and m columns.