ERRATA, UPDATES, AND OTHER NOTES REGARDING
George M. Bergman and Adam O. Hausknecht,
Cogroups and co-rings in categories of associative
American Mathematical Society, Mathematical Surveys and
Monographs #45, 1996.
IMPORTANT ERRATA: None yet -- have patience! (or send me some)
Pp. 29, 67, 223, 325: the section whose title is shown at the
top of each of these pages actually begins on the next page.
P.177, three lines above Theorem 33.7: the reference
to ``Theorem 23.9(i)'' should be to Theorem 25.1(i).
P.188, paragraph following Theorem 34.24: between the second and
third sentences, the stranded words ``a field.'' should be deleted.
P.283, last full line: "overgroup of B'"
should be "overgroup B'".
P.366, the page number reference for ``dependence among chapters and
sections'' should be ix, not iii.
Pp.240-256 (§§45-47): It would be interesting to
examine the relationship between the ring of representative
integer-valued functions on a free group G (§47), and
the ring of word functions on G as defined in
 (see below).
The latter could also be looked at as a generalization of the ring of
integral polynomials, discussed in §§45-46. Indeed, the
word functions on the group Z are precisely the integral
UPDATES to bibliography:
A published edition of those lecture notes has appeared:
George M. Bergman,
An Invitation to General Algebra and Universal Constructions,
In that edition, there are a few changes in the numbering
of results we refer to.
Listed by the relevant page numbers in Bergman-Hausknecht, they are
P.29. The results of  referred to on the last three
lines as "Theorem 7.9.4" and "Exercises 7.9:5-7.9:6
and 9.4:4" have
become "Theorem 7.10.4", and "Exercises 7.10:4-7.10:5 and 9.4:5".
26. This has appeared:
P.89, first paragraph of Sketch of Proof.
The results of  referred to as "Corollary 7.7.2"
and "Proposition 7.7.3" are now "Theorem 7.8.3" and
George M. Bergman, Colimits of representable algebra-valued
Theory and Applications of Categories, 20 (2008) 334-404.
The ``Erratum to appear''
has appeared: same journal, 80 (1995) p.293, and
the paper has been reviewed in Math Reviews: MR96a:18004.
This has also been reviewed: MR95m:16033.
Here are two new references, referred to under OTHER NOTES above:
205. Jean Eric Pin and Christophe Reutenauer,
A conjecture on the Hall topology for the free group,
Bull. Lond. Math. Soc. 23 (1991) 356-362.
(Note: the conjecture discussed in this paper
is proved in .)
206. Luis Ribes and Pavel A. Zalesskii,
On the profinite topology on a free group,
Bull. London Math. Soc., 25 (1993) 37-43.
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