identical substitution
... 恒等式；全等式 identical relation 恒等交换 identical substitution 恒等变换 identical transformation ...
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给出了满足某可变恒等式的半质环的交换性定理，推广了已有的结论。
In this paper, the author gave some commutativity theorems on semi-prime ring with variable identity, which is a generalization related.
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