Introduces the two-eigenvalue problem of a symmetric matrix and gives a formula to compute the matrix.

介绍了对称矩阵的两特征值问题，并给出了计算公式。

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In this paper, a kind of inverse eigenvalue problem which is the reconstruction of real symmetric five-diagonal matrix by five eigenvalues and corresponding eigenvectors is proposed.

本文讨论了一类由五个特征值和相应特征向量构造实对称五对角矩阵的特征值反问题。

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From given eigenvalues and eigenvectors, the inverse eigenvalue problem of symmetric ortho-symmetric positive semi-definite matrices and its optimal approximate problem were considered.

对给定的特征值和对应的特征向量，提出了对称正交对称半正定矩阵逆特征值问题及最佳逼近问题。

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