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Precovers and Preenvelopes by Phantom and Ext-Phantom Morphisms |
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| Authors: | Lixin Mao |
| Institution: | 1. Department of Mathematics and Physics, Nanjing Institute of Technology, Nanjing, Chinamaolx2@hotmail.com |
| Abstract: | |
| Keywords: | Ext-phantom morphism Phantom morphism Precover Preenvelope Ring homomorphism |