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Rows, Columns and the Main Diagonal of a Matrix

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The matrix shown has entries , where and .

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For example, the entry in the top-left corner is , where row 1 and column 1 intersect.

The entry is where row 3 and column 7 intersect.

The first row is the vector , where the first index is 1, the row number.

The second column is the vector , where the second index is 2, the column number.

The main diagonal consists of the entries for which .

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Contributed by: George Beck (July 2018)
Open content licensed under CC BY-NC-SA

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