Notation and Background
Citations of numbered items belong to the chapter in which they appear, unless it is explicitly stated that the item is from a different chapter (e.g., Theorem II.2.3). When the citation contains two index numbers (e.g., Theorem 1.1), it refers to the theorem in general. When the citation contains three index numbers (e.g., Corollary II.3.5.2), it refers to Item number 2 in Corollary II.3.5.
KeywordsAbelian Group Direct Summand Torsion Group Invariant Subgroup Pure Subgroup
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