... unipotent matrix 幂单矩阵 unique existence 唯一存在性 unique factorization domain 唯一析因整环 ...
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应用积分恒等式方法，证明了源项解的唯一存在性。
A unique solvability of the source term solution is obtained by applying integral identity methods.
证明了最佳逼近元的唯一存在性，并给出了最佳逼近元的计算公式。
The unique existence of the best element of approximation is proved and the formula of the best element of approximation is given.
证明了在某种紧性条件下拟桶式空间的强对偶空间值的向量测度的唯一存在性。
In some tightness condition, the existence and uniqueness of a vector measure with values in the strong dual of a quasi-barreled space is proved.
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