Unformatted text preview: T must also be onetoone. Since T is linear, there is a 3 × 3 matrix A such that T ( x ) = A x . Since T is onto, A has a pivot in every row. But since A is 3 × 3 A also has a pivot in every column. Thus T is onetoone. 4. Give an example of transformation that is onto but not onetoone. Let m and n be positive integers with n > m . Let T : R n → R m be given by T ( x ) = A x where A is any m × n matrix having a pivot position in every row. Then T is onto but not onetoone. For example, we could take T : R 3 → R 2 be given by T ( x ) = A x where A = • 1 0 0 0 1 0 ‚ ....
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 Spring '03
 F,newberger
 Math, Natural number, standard matrix, Cardinal number

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