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Algebraic number theory
Algebraic number theory is a major branch of number theory that studies algebraic structures related to algebraic integers. This is generally accomplished by considering a ring of algebraic integers ''O'' in an algebraic number field ''K''/Q, and studying their algebraic properties such as factorization, the behaviour of ideals, and field extensions. In this setting, the familiar features of the integers—such as unique factorization—need not hold. The virtue of the primary machinery employed—Galois theory, group cohomology, group representations, and ''L''-functions—is that it allows one to deal with new phenomena and yet partially recover the behaviour of the usual integers.
==History of algebraic number theory==
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