From the reviews: "Serre's notes on groups acting on trees have
appeared in various forms (all in French) over the past ten years and
they have had a profound influence on the development of many areas,
for example, the theory of ends of discrete groups. This fine
translation is very welcome and I strongly recommend it as an
introduction to an important subject. In Chapter I, which is
self-contained, the pace is fairly gentle. The author proves the
fundamental theorem for the special cases of free groups and tree
products before dealing with the (rather difficult) proof of the
general case." (A.W. Mason in Proceedings of the Edinburgh
Mathematical Society 1982)
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