Triangular matrix

An upper or lower triangular matrix has all entries on one side of the main diagonal equal to zero. Its eigenvalues, with algebraic multiplicity, are its diagonal entries.

A triangular matrix is a special type of square matrix (a matrix with an equal number of rows and columns) that has specific characteristics regarding the placement of its non-zero elements. There are two main types of triangular matrices: 1. **Upper Triangular Matrix**: An upper triangular matrix is a square matrix where all the elements below the main diagonal are zero.