Tridiagonal matrix

In linear algebra, a tridiagonal matrix is a band matrix that has nonzero elements only on the main diagonal, the first diagonal below(=left) this(=subdiagonal), and the first diagonal above(=right) the main diagonal(superdiagonal). [1]

즉, non-zero가 오직 {main,super,sub} diagonal에만 나타나는 행렬.

determinant

(cont.)