Abstract
Free products of groups with amalgamated subgroups, first introduced by Schreier (1927) and generalized by Hanna Neumann (1948), are here redefined, studied and applied to a number of problems in abstract group theory. The applications are mainly concerned with existence and embedding theorems. The first four chapters are self-contained, requiring little beyond the fundamentals of abstract group theory. Only in the last chapter is use made of theorems (Gruschko 1940; Kurosch 1934; Hanna Neumann 1949) which are not proved here.

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