Subject: Some Bangor preprints
From: "Ronnie Brown" <Ronnie@ll319dg.fsnet.co.uk>
Date: Sun, 4 Jun 2006 12:03:25 +0100

I have put some preprints on

http://www.bangor.ac.uk/~mas010/brownpr.html

1. Normalisation for the fundamental crossed complex of a simplicial
set. R. Brown and R. Sivera

This is but one more step in setting up crossed complexes as a basic,
somewhat nonabelian, tool in algebraic topology. It shows how crossed 
complexes are used to express and prove algebraically  a version of the 
homotopy addition lemma, and gives for  a theorem classical for simplicial 
abelian groups, an analogue whose proof we found tricky.

Comments welcome.

2. Analogy, concepts and methodology in Mathematics. R. Brown and T. 
Porter

This is an an article for students to appear in Eureka, Journal of the 
Archimideans at Cambridge. It is about, rather than on, mathematics. It 
includes two short quotations from Alexander Grothendieck's correspondence 
with me, 1982-1991, which seemed  relevant to the article.

Other Bangor preprints are on

http://www.informatics.bangor.ac.uk/public/mathematics/research/preprints/

There is  in the 2005, 2006 lists material on computing double cosets, 
global actions and groupoid atlases (!), HQFT, etc. etc.

I apologise for glitches with the availability and printing of my book. It 
is now back on the Booksurge site and amazon.com, corrected, and at $31.99 
(free postage in the USA from amazon.com). But I have not yet had my 
complimentary copy to confirm. See url below.

Ronnie Brown
www.bangor.ac.uk/r.brown/topgpds.html