Analysis of information sources in references of the Wikipedia article "Ma trận khối" in Vietnamese language version.
We shall find that it is sometimes convenient to subdivide a matrix into rectangular blocks of elements. This leads us to consider so-called partitioned, or block, matrices.
A matrix can be subdivided or partitioned into smaller matrices by inserting horizontal and vertical rules between selected rows and columns.
...provided the sizes of the submatrices of A and B are such that the indicated operations can be performed.