Bennett, G. K.; Grannell, M. J. and Griggs, T. S.
Non-orientable biembeddings of Steiner triple systems of order 15.
Acta Mathematica Universitatis Comenianae, 73(1) pp. 101–106.
It is shown that each possible pair of the 80 isomorphism classes of Steiner triple systems of order 15 may be realized as the colour classes of a face 2-colourable triangulation of the complete graph in a non-orientable surface. This supports the conjecture that every pair of STS()s, , can be biembedded in a non-orientable surface.
Actions (login may be required)