Ricardo Buring's user avatar
Ricardo Buring's user avatar
Ricardo Buring's user avatar
Ricardo Buring
  • Member for 12 years, 1 month
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19 votes
1 answer
3k views

When is the image of a null set also null?

14 votes
2 answers
2k views

Is there a more elementary proof of this special case of Riemann-Roch?

10 votes
1 answer
958 views

Generalization of Cayley-Hamilton

9 votes
1 answer
3k views

Why are hyperbolic toral automorphisms (e.g. Arnold's cat map) ergodic?

9 votes
0 answers
1k views

Integral of rational function over $\mathbb{H}^4$

6 votes
1 answer
488 views

Hausdorff dimension of Hamiltonian orbit closure and symplectic leaves

6 votes
1 answer
588 views

Does a birational map of an affine variety extend uniquely to a birational map of its projective closure?

6 votes
1 answer
1k views

What do the involutions of an elliptic curve look like?

5 votes
1 answer
2k views

How do I show that this curve has a nonsingular model of genus 1?

5 votes
2 answers
2k views

The curve $y^2 = f(x)$ where $f$ has degree $d$ and no repeated roots has genus $[(d-1)/2]$?

5 votes
3 answers
1k views

Why is $X^4 + \overline{2}$ irreducible in $\mathbb{F}_{125}[X]$?

5 votes
1 answer
1k views

What are the equations for the image of an algebraically defined subset under the Segre embedding?

5 votes
1 answer
874 views

Coefficients such that linear combination lies in an ideal

4 votes
1 answer
427 views

Does the Lorenz attractor contain critical points?

4 votes
2 answers
186 views

How big can the Hausdorff dimension of the closure of a smooth curve be?

4 votes
1 answer
545 views

Erroneous calculus of variations reference in V. I. Arnold's Mathematical Methods of Classical Mechanics?

4 votes
1 answer
474 views

The image of a map $H^2 \setminus \Delta \to \mathbf{R}^4$ where $H$ is the upper half-plane and $\Delta$ is the diagonal

4 votes
0 answers
831 views

Is this incidence variety in $\mathbb{P}^2 \times \mathbb{P}^2$ isomorphic to a variety in $\mathbb{P}^1 \times \mathbb{P}^1$?

3 votes
2 answers
163 views

Can the time mean over a dense orbit equal the space mean for arbitrary functions?

3 votes
1 answer
1k views

Maps between projective varieties given in coordinates by homogeneous polynomials of the same degree not simultaneously vanishing are morphisms

3 votes
2 answers
2k views

Why is this curve nonsingular?

3 votes
1 answer
659 views

Why is this Hilbert's Syzygy theorem?

3 votes
1 answer
225 views

Why do these geometric assumptions imply these statements about relative homology?

3 votes
1 answer
172 views

Is there a non-constant function $f: \mathbb{R}_{>0} \to \mathbb{R}$ such that $f(x) = f(x + 1/x)$?

3 votes
1 answer
220 views

Skew-symmetric multi-derivations of $k[x_1,\ldots,x_n]/I$

2 votes
0 answers
96 views

Hausdorff dimension of a dense orbit in the Lorenz attractor

2 votes
2 answers
130 views

Odd binomial sum equality has only trivial solution?

2 votes
1 answer
448 views

How to determine whether the images of two real embeddings of a number field are equal?

2 votes
1 answer
89 views

A tangent vector to the unit tangent bundle $T_1S^n$ at $(x,\xi)$ can be written $(X,Z)$ with $X \cdot x = 0$ and $Z \cdot \xi = 0$.

2 votes
1 answer
78 views

For $G$ an abelian group and $H$ a subgroup, is $[G : H]$ the smallest positive integer $n$ such that $ng \in H$ for all $g \in G$?