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Good congruences on a type σ semigroup * |
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| Authors: | Luo Yanfeng Guo Xiaojiang Xiaojiang |
| Institution: | 1. Department of Mathematics , Lanzhou University , Lanzhou, Gansu, 730000, P.R China E-mail: mailto:luoyf@lzu.edu.cn;2. Department of Mathematics , Sichuan Union University , Chengdu, Sichuan, 610064, P.R China |
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