Number of Rows and Columns in a 'm by n' Matrix

Quick reminder that m is the number of rows and n is the number of columns.

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0:00 Matching m by n to rows and columns
0:15 General Matrix Form Overview
1:07 Match index to value in a matrix examples

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[zulkiflkhan]

Sir why we use "m" for number of rows and "n" for number of column

[zulkiflkhan]

Why we have not used others letter instead of m, n