idempotent transformation
... idempotent property || 幂等性 idempotent transformation || 幂等变换 identic || 恒等的，同一的 ...
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等幂变换矩阵 idempotent transformation matrix
给出了两两互素多项式下线性变换的核的直和分解，并应用于幂等矩阵（对合矩阵）的秩的等式证明中。
The direct sum decomposition of the addition of a linear transformation under the coprime polynomial was given, and it was used in the proof of some equality about the rank of idempotent matrix.
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