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Euclidean, hyperbolic, discrete, convex, coarse geometry, metric spaces, comparisons in Riemannian geometry, symmetric spaces.

17 votes
1 answer
702 views

Is there a bounded sequence of points in the plane with pairwise distances at least $1/\sqrt...

Previously I have mentioned the following problem in an addition to the list of Contest problems with connections to deeper mathematics. Is there an infinite bounded sequence $(P_n) \subset \mathbb{ …
Vesselin Dimitrov's user avatar
8 votes
Accepted

approximate two different real numbers to order $\frac{1}{z^{3/2}}$

With the constant $1$, this is Minkowski's higher dimensional extension of Dirichlet's approximation theorem: If $\alpha_1, \ldots,\alpha_n$ are real numbers, then there are rationals $p_i/q$ with $| …
Vesselin Dimitrov's user avatar
34 votes

Can a unit square be cut into rectangles that tile a rectangle with irrational sides?

No. It is a famous problem. Suppose it were possible to cut the unit square into finitely many rectangles of sizes $a_i \times b_i$. This means that we have a decomposition $1 \otimes 1 = \sum_i a_i \ …
Vesselin Dimitrov's user avatar
3 votes
0 answers
149 views

Metric extensions of Littlewood's conjecture

Littlewood's conjecture on simultaneous rational approximation to a pair of real numbers, $$ \liminf_{n \in \mathbb{N}} \, n \cdot \mathrm{dist}(n\alpha,\mathbb{Z}) \cdot \mathrm{dist}(n\beta, \mathbb …
Vesselin Dimitrov's user avatar