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We characterize monoids over which all S-acts are CC-injective and find conditions under which CC-injectivity of all acts implies that all acts are C-injective.
Research of X. Zhang supported by the China Scholarship Council No. 2006101056.
Research of Y. Chen supported by the NNSF of China (No. 10771077) and the NSF of Guangdong Province (No. 06025062). 相似文献
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