2 papers
math.CO2024
Properties of Steiner triple systems of order 21
Grahame Erskine, Terry S. Griggs
Properties of the 62,336,617 Steiner triple systems of order 21 with a non-trivial automorphism group are examined. In particular, there are 28 which have no parallel class, six th…
math.CO2023
Mutually avoiding Eulerian circuits
Grahame Erskine, Terry Griggs, Robert Lewis +1
Two Eulerian circuits, both starting and ending at the same vertex, are avoiding if at every other point of the circuits they are at least distance 2 apart. An Eulerian graph which…