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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

0 votes
0 answers
701 views

Extensions of $\mathbb{Z}[\sqrt{-n}]$ that are UFD

EDIT: Since the original question was to vague I will pose some stronger conditions: Given $n \in \mathbb{N}$ with $n \geq 3$ I want to know if there is a ring $R$ with the following properties: $\ …
Martin's user avatar
  • 1,101
3 votes
2 answers
751 views

Primes of the form $p=x^2-ny^2$

I want to know which primes $p$ can be written in the form $p=x^2-ny^2$ for given $n \in \mathbb{N}$. If $n$ is squarefree, $n \not\equiv 1 \mod 4$ and $\mathbb{Z}[\sqrt{n}]$ is a principal ideal doma …
Martin's user avatar
  • 1,101
9 votes
2 answers
2k views

Completion and algebraic closure

Following this question: Given a valued field $K$, denote with $\bar{K}$ its algebraic closure and with $\hat{K}$ the completion. Then both $\hat{\bar{K}}$ and $\hat{\bar{\hat{K}}}$ are complete and …
Martin's user avatar
  • 1,101