Steiner systems $S(2,6,226)$ and $S(2,6,441)$ exist

Abstract

Via computer search, we found seven non-isomorphic $1$-rotational Steiner systems $S(2,6,226)$ and six point-transitive Steiner systems $S(2,6,441)$, resolving two of $29$ previously undecided cases for $S(2,6,v)$.

6 pages