Warren Dicks, Equivalence of the strengthened Hanna Neumann conjecture
and the amalgamated graph conjecture. Invent. Math. 117 (1994),
373-389.
Errata
October 21, 2003
On page 376, third last line, change "we will prove but not state that the
converse of Theorem 2.4 is true for" to "we will show that the conditions
in the conclusion of Theorem 2.4 determine a pullback diagram of".
On page 377, line 21, change "divdes" to "divides".
On page 380, lines 3-4, change
"every element of $G$ can be expressed uniquely in the form $hsk$ where $(h,s,k)
\in H \times S \times K"
to
"for every $g \in G$ there is a unique $s \in S$ such that $g = hsk$ for
some $(h, k) \in H \times K" .
On page 381, line 9, change $K \cap T$ to $K \backslash T$.
On page 389, lines 7 and 9, change "Math., Debrecen" to "Math. Debrecen".
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