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The sum of two [[matrix|matrices]] of the same dimensions (number of rows and columns) is the term by term sum: if $A$, $B$ are $(m \times n)$ matrices then the sum $A+B$ is also an $(m \times n)$ matrix with $(A+B)_{ij} = A_{ij} + B_{ij}$ for $i=1,\ldots,m$ and $j = 1,\ldots n$.

See also: [[Matrix multiplication]], [[Matrix ring]]

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How to Cite This Entry:
Matrix addition. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Matrix_addition&oldid=39508

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