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arXiv 2102.09834math.CT
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分类中的完整对象

Complete objects in categories

James Richard Andrew Gray

摘要:

我们在指向范畴中引入了原型完备、完备、完备 * 和强完备对象的概念。我们证明了在温和的条件下,每一个原型完全(分别完全)对象是一个阿贝尔原型完全(分别完全)对象和一个强完全对象的产品。这与观察,平凡组是唯一的阿贝尔完全组恢复一个定理贝尔分类完全群。此外,我们还推广了关于具有平凡中心(中心化子)的群(子群)的几个定理,并给出了具有平凡中心的完备李代数的导子代数和非交换(特征)单群的自同构群是强完备群的一个分类解释.

英文摘要:

We introduce the notions of proto-complete, complete, complete* and strong-complete objects in pointed categories. We show under mild conditions on a pointed exact protomodular category that every proto-complete (respectively complete) object is the product of an abelian proto-complete (respectively complete) object and a strong-complete object. This together with the observation that the trivial group is the only abelian complete group recovers a theorem of Baer classifying complete groups. In addition we generalize several theorems about groups (subgroups) with trivial center (respectively, centralizer), and provide a categorical explanation behind why the derivation algebra of a perfect Lie algebra with trivial center and the automorphism group of a non-abelian (characteristically) simple group are strong-complete.

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