Homotopy of Operads and Grothendieck–Teichmüller Groups: Parts 1 and 2

Even if the main goal of the first volume is to provide the reader with the necessary prerequisites to understand the deep theory developed by the author in the second volume, it, nevertheless, provides the literature with an interesting treatise, accessible to graduate students and to researchers working in any field. It should first be mentioned that the mathematical content covered here is absolutely beautiful...In the end, the present first volume of this treatise on the homotopy of operads and Grothendieck-Teichmüller groups represents a huge amount of work and is a valuable addition to the current mathematial literature.