Junnosuke Koizumi

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20232026

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math.CO2025

At most 10 cylinders mutually touch: a Ramsey-theoretic approach

Travis Dillon, Junnosuke Koizumi, Sammy Luo

Littlewood asked for the maximum number $N$ of congruent infinite cylinders that can be arranged in $R^{3}$ so that every pair touches. We improve upon the proof of the seco…

math.CO2024

A note on the Erdős conjecture about square packing

Jineon Baek, Junnosuke Koizumi, Takahiro Ueoro

Let $f (n)$ denote the maximum total length of the sides of $n$ squares packed inside a unit square. Erdős conjectured that $f (k^{2} + 1) = k$ . We show that the conjecture is true if we a…