The main aim of this book is to study the concept of multiplication objects from a categorical point of view, namely, in the setting of monoidal categories whic

Is there a vector space whose dimension is the golden ratio? Of course not—the golden ratio is not an integer! But this can happen for generalizations of vect

This book gives an exposition of the relations among the following three topics: monoidal tensor categories (such as a category of representations of a quantum

Category Theory is one of the most abstract branches of mathematics. It is usually taught to graduate students after they have mastered several other branches o