For strictly diagonally dominant matrices, this bounds are sharper than those of [1, Lin. Alg. Appl., 287(1999), 289-305] and [2, Lin. Alg. Appl., 330 (2001), 1-14].

• 对于严格对角占优矩阵的情形；三对角矩阵逆元素的界改进了文献[1； Lin.；Alg