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 1. A matrix with dimensions $m$ by $n$, where $m > n$, has fewer rows than columns.
 2. If matrices $A$ and $B$ have the same dimension, then $A + B = B + A$ is known as the Associative Property for Addition of Matrices.
 3. The $i$th row, $j$th column entry of a square matrix, where $i > j$, is called a diagonal entry.