Assertion: abelian group | /r/CapableOf | serve as constant source of examples
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Source sentences:
text: Owing to their relative simplicity and to the fact that they have been very thoroughly studied (which is confirmed, for instance, by the solvability of the elementary theory of Abelian groups), and to the availability of a sufficient variety of objects, Abelian groups serve as a constant source of examples in various fields of mathematics.