1 Table of Contents: “...) -- III Cartan Subalgebras -- IV The Algebra sl2 and Its Representations -- V Root Systems -- VI Structure...”

2 Table of Contents: “... and amalgams -- §5 Structure of a group acting on a tree -- §6 Amalgams and fixed points -- II. SL2 -- §1...”

3 Table of Contents: “...2. Modules, Weights, Primitive Elements -- 3. Structure of the Submodule Generated by a Primitive...”