, 
… matrix’s
Dealing with matrix’s:
Adding, abstraction of matrix's:
Definition:
, … matrix’s
Only valid for matrix with the same pieces of rows and columns!
For example:
, 
Matrix-mixing:
Definition:
, 
Only valid for matrix’s, where the number of the rows in the first one, are the same as the number of the second matrix’s columns.
For example:
, 
and 
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