Errata: Nonabelian Algebraic Topology

August 3, 2015

p.xxvi line -1: "no" should be "not".

Bottom of p. 369: "covariant" should be "contravariant".

p. 550 The down arrows in the main diagram should be up, or the rows swapped.

In the first printing, on p. 554 the dates in mid page should be 1964-1965.

August 24, 2015

p.319 Proposition 9.9.6 In accordance with the conventions of Chapter 13, the superscripts O and 1 in this proposition should be -, + respectively. Compare Lemma 13.7.1, which should be crossreferenced on p. 319.

October 4, 2018

p.237 Proposition 7.3.14 Replace "crossed modules" by"crossed complexes".

p.430 Exercise 12.7.8 Replace "refer forward" by "refer back". November 7, 2018 p.160 l.1 "Fig 6.3" should be "Fig 6.1" (the hyperref link is correct).