A triangular matrix is not necessarily nilpotent. A triangular matrix is nilpotent if and only if all its diagonal entries are zero. This means that for a triangular matrix to be nilpotent, it must be an upper or lower triangular matrix with all zero diagonal entries. **

A strictly upper triangular matrix that is nilpotent is a matrix where all the entries below the main diagonal are zero, and all the entries on the main diagonal are also zero. This means that the matrix is upper triangular and all its eigenvalues are zero. Since the matrix is nilpotent, there exists a positive integer k such that the matrix raised to the power of k is the zero matrix. **

Not necessarily. A nilpotent matrix is a square matrix where some power of the matrix is the zero matrix. This means that the diagonal entries of a nilpotent matrix could be non-zero, as long as the matrix raised to a certain power results in a zero matrix. So, the diagonal entries of a nilpotent matrix are not necessarily equal to 0. **

To determine the matrices with respect to a nilpotent mapping, one can start by finding the minimal polynomial of the mapping. The minimal polynomial will give the characteristic equation, which can be used to find the eigenvalues of the mapping. Once the eigenvalues are known, the corresponding eigenvectors can be found, and the matrices can be constructed using these eigenvectors. The matrices will then represent the nilpotent mapping with respect to a chosen basis. **

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