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==Applications of group theory==<!--this section is linked at from [[Applications of group theory]]-->
Applications of group theory are abound. Almost all structures in [[abstract algebra]] are special cases of groups. [[Ring (mathematics)|Rings]], for example, can be viewed as [[abelian group]]s (corresponding to addition) together with a second operation (corresponding to multiplication). Therefore, group theoretic arguments underlie large parts of the theory of those entities.
===Galois theory===
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