Hagen Knaf's user avatar
Hagen Knaf's user avatar
Hagen Knaf's user avatar
Hagen Knaf
  • Member for 13 years, 5 months
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2 votes

Non-Noetherian ring with a single prime ideal

2 votes

Limit of the sequence of regular n-gons.

2 votes
Accepted

Can an ideal of a ring be an ideal of a subring/superring too?

2 votes

Factorizing a polynomial $f$ in $A[x]$ (with $A$ commutative), where $f$ has a zero in its field of fractions

2 votes

Every finite subgroup of $\mathbb{Q}/\mathbb{Z}$ is cyclic

2 votes

Intersection of algebraic sets not equal to $\{0\}$?

2 votes

Normalization or integral closure of ring over $\mathbb Z_p$

2 votes
Accepted

Sppliting field and Galois theory and its Automorphism group

2 votes

Which general methods of field construction do we know?

2 votes

Birational map and birational morphism in algebraic geometry

2 votes
Accepted

Is an extension of a discrete absolute value discrete too?

2 votes

A single-segment Newton polygon implies henselian?

2 votes

Contrasting definitions of bimodules? An illusion?

2 votes

Generators of the Relations of a Galois Extension

2 votes
Accepted

Contracted ideals in number fields

2 votes

module over a quotient of a principal ideal domain

2 votes
Accepted

Confusion regarding proof of a proposition in Field Theory (Dumb Question)

2 votes
Accepted

Examples where there is no power integral basis

2 votes
Accepted

A question about separable extension

2 votes

If $f,g$ are two endomorphisms of $E$ such that $f(g(x))=g(f(x))$ and $g$ is nilpotent show that: $f$ is invertible => $f+g$ is invertible

2 votes

Is the degree function well behaved over power series?

2 votes

Compactness of the complex points of a $\mathbb{C}$-variety

2 votes

Question about extensions of homomorphisms

2 votes

Non-trivial valuation of $\mathbb R$

2 votes

Given an arbitrary commutative ring $A$, does integral closure always exist?

2 votes

Prime divisor in a finite group

2 votes
Accepted

Formal power series ring over a valuation ring of dimension $\geq 2$ is not integrally closed.

2 votes

How to prove this: If $t$ is a transcendental number, then $5t^{4}+8t+3$ is also transcendental?

2 votes

Is the algebraic subextension of a finitely generated field extension finitely generated?

2 votes
Accepted

The field of Laurent series over $\mathbb{C}$ is quasi-finite

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