The international School and Conference in Algebraic Topology took place in the Great Hall of the Vietnam National University, Hanoi August 9-20, 2004. This was an event to celebrate the 60th birthday of our colleague and friend Professor Huỳnh Mùi.

The Organizing Scientific Committee was formed by John Hubbuck (Univ. of Aberdeen, Aberdeen), Nguyễn H V Hưng (Vietnam National Univ., Hanoi), Haynes Miller (MIT, Cambridge), Goro Nishida (Kyoto Univ., Kyoto), Stewart Priddy (Northwestern Univ., Evanston) and Lionel Schwartz (Univ. de Paris 13, Paris).

We are grateful to the Vietnam National University, Hanoi, the Department of Mathematics, VNU, the Vietnam Science Foundation, as well as the National Science Foundation (USA) for their generous support of the international School and Conference in Algebraic Topology, Hanoi 2004.

The school took place from August 9 to August 14, 2004. There were three courses in the school, each contained six one-hour lectures, given respectively by J Hubbuck, H Miller, and S Priddy.

The conference took place from August 16 to August 20, 2004. Its main topics were the Steenrod algebra, invariant theory, classifying spaces, and group cohomology. Titles of the talks delivered at the conference as well as a list of participants are included below.

The present Proceedings is a collection of articles in honor of Huỳnh Mùi. It contains transcripts of some of the school courses and the conference talks as well as related articles presented specifically for the Proceedings. Each article has been undergone a strict refereeing process. The proceedings is the intention of all participants and contributors to honor Huỳnh Mùi, the founder of the Vietnam school in Algebraic Topology.

John Hubbuck, Nguyễn H V Hưng, and Lionel Schwartz

Hanoi, August 28, 2006