An orthogonal matrix is an invertible matrix for which the inverse is equal to the transpose.

正交矩阵是可逆矩阵，其逆矩阵等于其转置矩阵。

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Then T is an invertible linear operator preserving rank - partial ordering on Sn(F) if and only if there exists an invertible matrix (F) such that where .

刻画了在非负无零因子交换半环上强保持可逆矩阵的线性算子。

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A square real matrix a is called an S2NS matrix, if every matrix with the same sign pattern as a is invertible, and the inverses of all such matrices have the same sign pattern.

一个实方阵a称为是S2NS阵，若所有与A有相同符号模式的矩阵均可逆，且它们的逆矩阵的符号模式都相同。

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