More on the 3p paper

I wrote here about Peter Neumann’s paper on primitive permutation groups of degree 3p, where p is a prime number.

Well, summer is almost over, but my undergraduate research intern Marina Anagnostopoulou-Merkouri and I have done our work and produced our paper, which is a combination of new combinatorial results about association schemes with prescribed eigenvalue multiplicities, a historical note on the context of the original paper, and a tribute to Peter. The paper is on the arXiv, here.

In the course of doing this work, Marina found several misprints in my re-typed version of the 3p paper. I have corrected these and posted a new version on the arXiv, here.