The eigenvalues of a triangular matrix are on the diagonal. A diagonal matrix is diagonalizable. Eigenvectors from distinct eigenvalues are linearly independent. There exists a matrix that is invertible but not diagonalizable.

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Mark each statement T if the statement is always true or F if it’s ever false. Do not assume anything beyond what is explicitly stated.

 

### Linear Algebra Properties of Matrices

(e) **The eigenvalues of a triangular matrix are on the diagonal.**
- In a triangular matrix (whether upper or lower triangular), the eigenvalues are found directly on the diagonal elements. This property simplifies the calculation of eigenvalues in such matrices.

(f) **A diagonal matrix is diagonalizable.**
- A diagonal matrix is already in its simplest form, and thus it is inherently diagonalizable. A matrix is diagonalizable if it is similar to a diagonal matrix, meaning there exists a matrix \(P\) such that \(P^{-1}AP\) is diagonal.

(g) **Eigenvectors from distinct eigenvalues are linearly independent.**
- If a matrix has distinct eigenvalues, the eigenvectors corresponding to these distinct eigenvalues are linearly independent. This property is essential in understanding the dimensionality and the structure of eigenspaces.

(h) **There exists a matrix that is invertible but not diagonalizable.**
- It is possible for an invertible matrix to not be diagonalizable. This occurs, for example, when the matrix has defective eigenvalues (eigenvalues which do not have enough linearly independent eigenvectors to form a basis). One such example is a Jordan block matrix.

These properties are fundamental in the study and application of linear algebra, especially in understanding the behavior and transformations associated with matrices.
Transcribed Image Text:### Linear Algebra Properties of Matrices (e) **The eigenvalues of a triangular matrix are on the diagonal.** - In a triangular matrix (whether upper or lower triangular), the eigenvalues are found directly on the diagonal elements. This property simplifies the calculation of eigenvalues in such matrices. (f) **A diagonal matrix is diagonalizable.** - A diagonal matrix is already in its simplest form, and thus it is inherently diagonalizable. A matrix is diagonalizable if it is similar to a diagonal matrix, meaning there exists a matrix \(P\) such that \(P^{-1}AP\) is diagonal. (g) **Eigenvectors from distinct eigenvalues are linearly independent.** - If a matrix has distinct eigenvalues, the eigenvectors corresponding to these distinct eigenvalues are linearly independent. This property is essential in understanding the dimensionality and the structure of eigenspaces. (h) **There exists a matrix that is invertible but not diagonalizable.** - It is possible for an invertible matrix to not be diagonalizable. This occurs, for example, when the matrix has defective eigenvalues (eigenvalues which do not have enough linearly independent eigenvectors to form a basis). One such example is a Jordan block matrix. These properties are fundamental in the study and application of linear algebra, especially in understanding the behavior and transformations associated with matrices.
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