Jürgen Böhm's user avatar
Jürgen Böhm's user avatar
Jürgen Böhm's user avatar
Jürgen Böhm
  • Member for 9 years, 1 month
  • Last seen more than a week ago
11 votes
Accepted

Find all integers $x$, $y$, and $z$ such that $\frac{1}{x} + \frac{1}{y} = \frac{1}{z}$

7 votes

How to learn commutative algebra?

6 votes

$\alpha \in \overline{\mathbb{F}}_q$ satisfying $\alpha^{q+1}+\alpha=-1$

6 votes
Accepted

Isomorphism of Proj schemes of graded rings, Hartshorne 2.14

6 votes
Accepted

Projective transformation a parabola to a circle

5 votes
Accepted

Dense basic open set contained in dense open subset

5 votes
Accepted

Find the sum of coefficient of all the integral power of $x$ in the expansion of $\big(1 + 2\sqrt x\big)^{40}$?

5 votes
Accepted

Exercise I 5.4 Hartshorne

5 votes

Does dominant morphism of integral schemes is injective on sheaves?

5 votes
Accepted

Elliptic curve $y^2= x^3 + x$ over the finite field $\mathbb{F}_p$ with $p \geq 3$.

5 votes

Is the irreducibility of a ring preserved by localization at a prime ideal?

4 votes
Accepted

Does flatness imply components map dominantly?

4 votes

Dimension of the space of cubic polynomials over $\mathbb{P}^5$ which vanish on the Veronese surface.

4 votes
Accepted

Resultant property for Integral Domain

4 votes
Accepted

Question on the existence of a prime ideal contained in the $\ker$ of a homomorphism $\mathbb{C}[x,y]\rightarrow\mathbb{C}[t]$.

4 votes

If $(3)=\mathfrak p_3\mathfrak p_3'$ then we can write $\mathfrak p_3=(3,1+\sqrt{17})$

4 votes
Accepted

Noether Normalization Steps

3 votes
Accepted

Showing $\hat{A} \otimes_{A} M \cong \hat{M}$ when $M$ is a finitely generated free $A$-module.

3 votes

Affine open sets of projective space and equations for lines

3 votes
Accepted

Complement of open set is finite in Zariski topology

3 votes

Every point lies on a unique secant through $C$

3 votes
Accepted

Prime ideal generated by $\operatorname{height}P$ elements

3 votes
Accepted

Proof that $f\in R[X]$ with $f(u)=u^{-1}$ exists for commutative ring $R$

3 votes

Neat way to find the kernel of a ring homomorphism

2 votes
Accepted

$f(x)$ has factor $x-a$ iff $R$ is UFD?

2 votes
Accepted

Prove that $J$ is an ideal.

2 votes
Accepted

Differential forms on a scheme: unclear equation

2 votes

Line bundle trivial on fibers then isomorphic to the pullback of a line bundle

2 votes

The polynomial ring in two variables is a free module over the ring of symmetric polynomials

2 votes

Constructing realizations of Hilberts weak Nullstellensatz?