Definition.
It is called sum of 2d arrays A and B and is noted A+B, the 2d array
Properties of the adition of 2d arrays
1. Associativity. (A+B)+C= A+(B+C),
2. Commutativity. A+B=B+A
3.Neutral element
4.Opposite element
Definition.
It is called the difference of the 2d arrays A and B and is noted with A-B, the 2d array A+(-B).