Using sets of finitely generated Abelian groups closed under the discrimination operator, we describe principal universal classes 𝒦 within a quasivariety 𝔄p, the class of groups whose periodic part is a p-group for a prime p. Also the concept of an algebraically closed group in 𝒦 is introduced, and such groups are classified.

中文翻译：

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阿贝尔群的泛类中的规范闭群和代数闭群

使用在判别算子下闭合的有限生成阿贝尔群的集合，我们描述了拟变异 𝔄p 中的主要泛类 𝒦，该类群的周期部分是质数 p 的 p 群。还引入了𝒦中代数闭群的概念，并对这些群进行了分类。