A determinant whose only nonzero elements occur in square blocks centered about the principal diagonal is in block-diagonal form . 仅有的非零元素集中于主对角线的方块中的行列式是分块对角形式的。
2.
A determinant in which all elements are zero except the elements of the principal diagonal and the elements immediately above and below this diagonal is called a continuant . 一个行列式除了主对角元素以及紧靠对角线的上面和下面的元素外，所有的元素均为零者叫做连行列式。
