Section 7.2 Terminology and notation
- scalar matrix
a square matrix that is equal to a scalar multiple of the identity matrix
- diagonal matrix
a square matrix where all entries that are not on the main diagonal are equal to zero
- upper triangular matrix
a square matrix where all entries that are below the main diagonal are equal to zero
- lower triangular matrix
a square matrix where all entries that are above the main diagonal are equal to zero
- symmetric matrix
a square matrix that is equal to its own transpose