A block matrix is a matrix that is partitioned into smaller matrices, known as "blocks." These smaller matrices can be of different sizes and can be arranged in a rectangular grid format. Block matrices are particularly useful in various mathematical fields, including linear algebra, numerical analysis, and optimization, as they allow for simpler manipulation and operations on large matrices. ### Structure of Block Matrices A matrix \( A \) can be represented as a block matrix if it is partitioned into submatrices.
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