《山东大学学报(理学版)》 ›› 2020, Vol. 55 ›› Issue (8): 1-5.doi: 10.6040/j.issn.1671-9352.0.2019.869
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李园,姚海楼*
LI Yuan, YAO Hai-lou*
摘要： 对于一个余代数,首先引入了余模的(预)覆盖的概念并给出关于它的一些性质;然后,引入了极大倾斜余模和覆盖余模的概念,并证明倾斜挠自由类和极大倾斜余模之间存在一个双射;最后,得到了在余代数中当倾斜挠自由类是覆盖类时,它是由覆盖余模唯一表示的。
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