books.google.ru - The main feature of this book is a systematic application of elementary geometric and topological techniques for solving problems that arise naturally in algebra. After an account of preliminary material, there is a discussion of a geometrically intuitive interpretation of the derivation of consequences...http://books.google.ru/books/about/Geometry_of_defining_relations_in_groups.html?id=jwNkqFQn-GcC&utm_source=gb-gplus-shareGeometry of defining relations in groups
