International Journal of Mathematics and Mathematical Sciences
Volume 2 (1979), Issue 2, Pages 251-260

The four known biplanes with k=11

Chester J. Salwach1 and Joseph A. Mezzaroba2

1Department of Mathematics, Lafayette College, Easton 18042, Pennsylvania, USA
2Department of Mathematics, Villanova University, Villanova 19085, Pennsylvania, USA

Received 21 May 1978

Copyright © 1979 Chester J. Salwach and Joseph A. Mezzaroba. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The four known biplanes of order 9(k=11) are described in terms of their ovals, λ-chain structures, and automorphism groups. An exhaustive computer search for all biplanes of order 9 with certain chain structures has produced but two, one of which is new. None of these four biplanes yield the putative plane of order 10.