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# Prove that the reduced echelon form of a matrix is unique, as follows. Suppose B and C

**Chapter 1, Problem 16**

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**QUESTION:**

Prove that the reduced echelon form of a matrix is unique, as follows. Suppose B and C are reduced echelon forms of a given nonzero \(m \times n\) matrix A.

a. Deduce from the proof of Proposition 4.2 that B andC have the same pivot variables.

b. Explain why the pivots of B and C are in the identical positions. (This is true even without the assumption that the matrices are in reduced echelon form.)

c. By considering the solutions in standard form of Bx = 0 and Cx = 0, deduce that B = C.

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### Questions & Answers

**QUESTION:**

Prove that the reduced echelon form of a matrix is unique, as follows. Suppose B and C are reduced echelon forms of a given nonzero \(m \times n\) matrix A.

a. Deduce from the proof of Proposition 4.2 that B andC have the same pivot variables.

b. Explain why the pivots of B and C are in the identical positions. (This is true even without the assumption that the matrices are in reduced echelon form.)

c. By considering the solutions in standard form of Bx = 0 and Cx = 0, deduce that B = C.

**ANSWER:**

Step 1 of 4

It is given that, and are the reduced echelon forms of a given nonzero matrix .

It is known that every leading entry is for the reduced echelon form.

Also, all the entries of the column above each leading entry are .

To prove that the reduced echelon form of a matrix is unique.