| 1. | Positive semi-definite matrices are positive definite if and only if they are nonsingular .
正半定矩阵是正定的，当且仅当它们是非奇异矩阵。 |
| 2. | Explicit inverses of nonsingular tridiagonal matrices
非奇异三对角矩阵的显式逆 |
| 3. | New practical determinate conditions for nonsingular h - matrices
矩阵的实用性新判定 |
| 4. | A new type of determinate conditions for nonsingular h - matrices
矩阵一类新的实用性判据 |
| 5. | Sufficient conditions for nonsingular h - matrices
矩阵的充分性判别条件 |
| 6. | Graded nonsingular triangular matrix rings
分次非奇异三角矩阵环 |
| 7. | Determination of nonsingular matrix
矩阵非奇异性判定 |
| 8. | Two subsets of nonsingular h - matrix
矩阵的两个子类 |
| 9. | Two proof methods of lower bound theorem of least singular value of nonsingular
矩阵最小奇异值的下界定理的两种证明方法 |
| 10. | A kind of new nonsingular boundary integral equations for elastic plane problems
弹性力学平面问题中一类无奇异边界积分方程 |
