9. The set of all 2 x 2 matrices of the form 07 0 b] with the standard matrix addition and scalar multiplication.

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ISBN:9780470458365
Author:Erwin Kreyszig
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Showthat the closure axioms ( 1and 6) and the axioms for the zero vector (4) and the negative vector (5) all hold
**9. The set of all \(2 \times 2\) matrices of the form**

\[
\begin{bmatrix}
a & 0 \\
0 & b
\end{bmatrix}
\]

**with the standard matrix addition and scalar multiplication.**

**Explanation:** 

This entry describes a specific type of \(2 \times 2\) matrix known as a diagonal matrix. In this form, all the non-diagonal elements are zero. The variables \(a\) and \(b\) can be any real numbers, representing the elements on the main diagonal.

**Operations:**

- **Matrix Addition:** When adding two matrices of this type, the resulting matrix will have diagonal elements which are the sums of the corresponding diagonal elements of the two matrices.

- **Scalar Multiplication:** When multiplying a matrix by a scalar, each element in the matrix, including both diagonals, is multiplied by that scalar. The zero elements remain unchanged.
Transcribed Image Text:**9. The set of all \(2 \times 2\) matrices of the form** \[ \begin{bmatrix} a & 0 \\ 0 & b \end{bmatrix} \] **with the standard matrix addition and scalar multiplication.** **Explanation:** This entry describes a specific type of \(2 \times 2\) matrix known as a diagonal matrix. In this form, all the non-diagonal elements are zero. The variables \(a\) and \(b\) can be any real numbers, representing the elements on the main diagonal. **Operations:** - **Matrix Addition:** When adding two matrices of this type, the resulting matrix will have diagonal elements which are the sums of the corresponding diagonal elements of the two matrices. - **Scalar Multiplication:** When multiplying a matrix by a scalar, each element in the matrix, including both diagonals, is multiplied by that scalar. The zero elements remain unchanged.
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