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Everything about Algebraic Number Theory totally explained

Algebraic number theory is a branch of number theory in which the concept of a number is expanded to the algebraic numbers, which are roots of polynomials with rational coefficients. An algebraic number field is any finite (and therefore algebraic) field extension of the rational numbers. These fields contain elements analogous to the integers, the so-called algebraic integers. In this setting, the familiar features of the integers (for example, unique factorization) need not hold. The virtue of the machinery employed — Galois theory, group cohomology, class field theory, group representations and L-functions — is that it allows one to recoverthat order partly for this new class of numbers.

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