Subject: groupoids Date: 06 Jan 2003 09:58:11 +0000 From: N.P.Strickland@sheffield.ac.uk A message for the mailing list: Ronnie Brown has asked me to point out that the references for Section 6 of my paper "K(n)-local duality for finite groups and groupoids" are seriously deficient. This section contains an exposition of, and some minor additions to, the homotopy theory of groupoids. Ronnie's paper "From groups to groupoids" contains a survey of this topic with an extensive bibliography. Perhaps half of my Section 6 can be extracted from the literature, with Ronnie's paper "Fibrations of groupoids" being particularly relevant. I apologise for these oversights. Neil Strickland