Author

Sam Mattheus

h-index 7 View on Semantic Scholar

We have 2 of 27 papers

We haven’t gathered this author’s papers yet. Follow them and we’ll fetch their work.

Not the right person? Other researchers publish under this name.

Preprint Aug 2026

There are no sharply transitive subsets of $\mathrm{SL}(2,q)$ for $q\ge 13$

It was known at least to L.E. Dickson in 1901 that $\mathrm{SL}(2,q)$, in its natural action on $\mathbb{F}_q^2\setminus\{0\}$, has a sharply transitive subgroup only when $q\in\{2,3,5,7,11\}$. For $q$ prime, this result stems from Galois'letter to Chevalier in 1832. We extend this result to sharply transitive subsets...

J. Bamberg, Sam Mattheus · 0 citations

Preprint Aug 2026

An improved algebraic construction for Ramsey numbers

We provide an explicit algebraic construction showing that, uniformly for integers $3 \leq s \leq t$, as $t \to \infty$, \[ R( s,t ) \geq t^{(1-o(1)) \log s / \log(\log s + 1) }. \] For large fixed $s$, this improves the dependence on $s$ in the general off-diagonal construction of Alon and Pudl\'ak. In particular, $R(...

F. Ihringer, Sam Mattheus · 3 citations · ⚡1