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Exercise 3.1.4
Answers
A matrix who interchanges the -th and the -th rows is also a matrix who interchanges the -th and the -th columns. A matrix who multiplies the -th row by scalar is also a matrix who multiplies the -th column by scalar . A matrix who adds times the -th row to the -th row is also a matrix who adds times the -th column to the -th column.
