**Errata `Topology and groupoids' First printing**

Not surprisingly, there are a few corrections, and this list will be updated periodically.

July 2012: p.379, Ex 9: "define a factor" should be "define a functor"

February, 2011: I have found that the bibliography has a wrong ordering of the entries, so I have compiled a new version with the correct order, which may be downloaded as pdf file here.

**Misprints in the first April 3, 2006, printing, corrected in the May 17,
2006 printing**

p.ii replace `informtation' by `information'

p. viii l.16 replace `nations' by `notions'

p.xii l.14 replace `mew section' by `new sections'

p.xxi diagram and the following paragraph: \mathbb I should be **I**

p.157 l.-9 Replace `homeomorphism' by `homomorphism'.

p.309 l.3 The first reference should be to J.P. May `A concise course in algebraic topology', Chicago University Press, revised version downloadable from Peter May's web page.

l.4 [Bro73] should be [Bro70]

p.311 l.11 omit one of the `between'

p.312 l.14 replace `form' by `from'

l.10 replace `rom' by `from'

p.333 In 8.4.1, it is necessary to assume C is totally disconnected, so that
in what follows we do not need y and in the formulae in the statement and
proof we replace *y* by *x*. This makes it quite clear that in
the proof of the Corollary, ρ does preserve,
or if you like, kill, the relations.

l.-9 replace `section' by `chapter'.

p.336 l.8 Insert `form' after `normal'.

p.393 l.9 replace [Bro73] by [Bro87].

p.423 Exercise 1. Replace the final `*G'* by `*N*'.

**Misprints still found in the May 17, 2006, printing**

p.14 Exercise 1.3.2 The codomain of the function should be [0,2].

p.104 Exercise 3(iii) should read
*x*^{2}*y*^{2} = 1, not
* x*^{2}*y*^{2} = 0.

Chapter 9. p.342, 343: The term `0-identification map' should be replaced by `universal morphism'.

p.354, 356, 357 references to 9.1.9 (Corollary) should be to 8.4.2 (Corollary)

**The above are corrected in the May 21, 2007, printing by Bookforce. **

**Misprint found October 12, 2008**

p.392 10.6.4 (Corollary 1) Replace H(x)/C by G(px)/C

**Misprint found July 30, 2009**

p. 417, l.6 replace φ^{*} p = φ by φ^{*} p_{*} = φ

** Mistakes found September, 2011**

p. 231 The definition of *constant homotopy* should be that *F(x,ι)*
is an identity for all objects *x* of *C*.

p. 371 l.-11 , -8 Replace second `=' by `-'.

p.497 The symbols for the unit interval groupoid for p. 217, 233 should be **I**.

** January, 2013 **

February, 2013

p. 9 In Exercise 7, the right hand sides of the two equations in (b), (c) should have "a" replaced by "f(a)".

p.14 Exercise 2. The function should have range [0,2], not [0,1].

p.476 ref [Die71] Should have title `Partitions of unity in homotopy theory'. And the name should be "tom Dieck, Tammo"

p.353 I am preparing a correction for this section, [See below for April 2.] since the proof of 9.2.1 assumes X_{1}, X_{2} are connected, as pointed out by Omar Camarena.
This problem is related to work on the Phtagmen Brouwer property in [Wil49], which proves two formulations of the PBP are equivalent for locally connected spaces,
and one of which is essentially the version for which this proof works. Also relevant is the proof of the Jordan Curve Theorem in [Mun75], which uses covering spaces
rather than groupoids for this type of result.

** March 3, 2014**

** April 2, 2014**

** April 4, 2014**

** April 9, 2015**

We also need to assume

** July 13, 2015**

p. 94. Exercise 6. The term "homeomorphism into" should be replaced by "embedding". The first term is actually in the index and refers to p.44, which defines only an "embedding".

p.95 Exercise 13. The assumption "Im f is closed" is redundant since f is proper, and X is closed.

p.103. l. -13. In the sentence beginning "Also, if A is saturated, ..." the condition given holds for all A, so the phrase between commas can be omitted.p.112, Exercise 3. It seems that the assusmption that A is closed is unnecessary. The relevant information is in 4.3.1.

** August 23, 2015**

p.239 Exercise 11 of Section 6.6. The category C has to be assumed to be non empty.

** September 11, 2016**

** January 2020**