Abstract
Direct products are introduced, and two proofs of the Fundamental Theorem of Abelian Groups are presented. The third section discusses ‘semi-direct products’, a variant of the direct product construction, and the groups of order 12 are described (they can all be treated as semi-direct products). Some basic facts, but no proofs, concerning infinite Abelian groups are given in Web Section 7.5. Except for some problems, this is the only point where specifically infinite groups are considered in any detail.
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