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Algebraic number fields, Algebraic integers, Arithmetic Geometry, Elliptic Curves, Function fields, Local fields, Arithmetic groups, Automorphic forms, zeta functions, $L$-functions, Quadratic forms, Quaternion algebras, Homogenous forms, Class groups, Units, Galois theory, Group cohomology, Étale cohomology, Motives, Class field theory, Iwasawa theory, Modular curves, Shimura varieties, Jacobian varieties, Moduli spaces

21 votes
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Brauer–Siegel's Theorem and application

If $K$ is a number field, then its regulator is always larger than $1/5$. In fact, the paper Friedman, E., Analytic formulas for the regulator of a number field, Invent. Math. 98 (1989) 599–622, conta …
Alexander Kalmynin's user avatar
4 votes
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Chowla's theorem on class number of real quadratic field

Note that $$ \prod_{n=1}^{p-1}(1-\zeta^n)=\Phi_p(1)=p, $$ where $\Phi_p(x)=\frac{x^p-1}{x-1}$ is the cyclotomic polynomial. Next, $1-\zeta^{p-n}=-\zeta^{-n}(1-\zeta^n)$, hence we have $$ p=\prod_{n=1} …
Alexander Kalmynin's user avatar