On first using this web site, or in the event of any difficulty using it, please consult the page which explains what technology the web site uses and what technology it expects from your browser.
This web site is mainly devoted to BIBDs, Nested BIBDs, OBIBDs and Nested OBIBDs, but other types of design will also figure. It will include constructions and properties of all these designs not reported elsewhere, so far as I am aware, definitions and examples of new design types, and non-exhaustive lists of designs, from searches (including the order of the automorphism group, where possible.) It is intended to reflect my own interests, and not as a rival to any other such: it is not a didactic tool, things will be included or excluded as the spirit moves me.
In many cases, I do not know whether the results given here are original or not, as I live in a very complicated world: if anyone objects that he/she should be given the credit for something given here, let him/her email me with the details and I will try to do him/her justice.
I shall confine all general references, as far as possible, to Beth, Jungnickel & Lenz's Design Theory (1st edition) (referred to as BJL) or to the CRC Handbook of Combinatorial Designs edited by Colbourn & Dinitz (HCD).
The automorphism groups were calculated with the aid of the set of procedures nauty, downloadable from http://cs.anu.edu.au/~bdm/nauty/, written by B.D.McKay. Responsibility for the correctness of the results rests with me.
Site Last Updated: 9th February 2008