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.
To see if anything has changed since last you logged in, click on "What's new?" in the menu above. Did I need to state that?
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 informal constructions and properties of these designs, examples, 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. Updates have been suspended since October 2004, but will now be resumed on a limited basis.
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.
Some references are given, but I cannot guarantee that all relevant ones are listed.
The automorphism groups were calculated with the aid of the set of procedures nauty, downloadable from here, written by B.D.McKay. Responsibility for the correctness of the results, as of everything else, rests with me.
Details of groups are as given in GAP. Again, any errors arising in their use are my responsibility.
I have removed the email link because I am getting so much junk email (based, I assume, on automated scanners): those who wish to contact me can just substitute "rees@" for "www." in the web address.
Site last updated: 28th January 2009
By D.H.Rees