Find the adjacency matrices for the directed graphs in (a) and (b). (a) V3 V1 V2 For the adjacency matrix, the rows and columns are ordered v, through v 2 1 2 1 (b) V2 V1

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Chapter2: Second-order Linear Odes
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Find the adjacency matrices for the directed graphs in (a) and (b).
 
**Finding Adjacency Matrices for Directed Graphs**

**Graph (a):**

- **Vertices and Edges:**
  - The graph consists of three vertices: \( v_1, v_2, v_3 \).
  - Edges are directed as follows:
    - \( e_1 \) from \( v_1 \) to \( v_2 \)
    - \( e_2 \) from \( v_2 \) to \( v_1 \)
    - \( e_3 \) from \( v_3 \) to \( v_1 \)

- **Adjacency Matrix:**
  - The rows and columns of the matrix are ordered \( v_1, v_2, v_3 \).
  - The matrix is:

    \[
    \begin{bmatrix}
    0 & 2 & 1 \\
    2 & 0 & 0 \\
    1 & 0 & 0
    \end{bmatrix}
    \]

  - Explanation:
    - The entry at row \( i \), column \( j \) represents the number of directed edges from vertex \( v_i \) to vertex \( v_j \).
    - For example, there are two edges from \( v_1 \) to \( v_2 \) as indicated by the value 2 in the first row, second column.

**Graph (b):**

- **Vertices and Edges:**
  - The graph consists of four vertices: \( v_1, v_2, v_3, v_4 \).
  - Edges are directed as follows:
    - \( e_1 \) is a loop from \( v_1 \) to \( v_1 \)
    - \( e_2 \) from \( v_1 \) to \( v_3 \)
    - \( e_3 \) from \( v_3 \) to \( v_1 \)
    - \( e_4 \) from \( v_3 \) to \( v_2 \)
    - \( e_5 \) from \( v_3 \) to \( v_4 \)

- **Adjacency Matrix:**
  - The rows and columns of the matrix are ordered \( v_1, v_2, v_3, v_4 \).
  - The matrix is:

    \[
Transcribed Image Text:**Finding Adjacency Matrices for Directed Graphs** **Graph (a):** - **Vertices and Edges:** - The graph consists of three vertices: \( v_1, v_2, v_3 \). - Edges are directed as follows: - \( e_1 \) from \( v_1 \) to \( v_2 \) - \( e_2 \) from \( v_2 \) to \( v_1 \) - \( e_3 \) from \( v_3 \) to \( v_1 \) - **Adjacency Matrix:** - The rows and columns of the matrix are ordered \( v_1, v_2, v_3 \). - The matrix is: \[ \begin{bmatrix} 0 & 2 & 1 \\ 2 & 0 & 0 \\ 1 & 0 & 0 \end{bmatrix} \] - Explanation: - The entry at row \( i \), column \( j \) represents the number of directed edges from vertex \( v_i \) to vertex \( v_j \). - For example, there are two edges from \( v_1 \) to \( v_2 \) as indicated by the value 2 in the first row, second column. **Graph (b):** - **Vertices and Edges:** - The graph consists of four vertices: \( v_1, v_2, v_3, v_4 \). - Edges are directed as follows: - \( e_1 \) is a loop from \( v_1 \) to \( v_1 \) - \( e_2 \) from \( v_1 \) to \( v_3 \) - \( e_3 \) from \( v_3 \) to \( v_1 \) - \( e_4 \) from \( v_3 \) to \( v_2 \) - \( e_5 \) from \( v_3 \) to \( v_4 \) - **Adjacency Matrix:** - The rows and columns of the matrix are ordered \( v_1, v_2, v_3, v_4 \). - The matrix is: \[
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