The purpose of this book is to study the structures needed to model objects in universal algebra, universal coalgebra and theoretical computer science. Universa

Rich in examples and intuitive discussions, this book presents General Algebra using the unifying viewpoint of categories and functors. Starting with a survey,

An accessible introduction to coalgebra, with clear mathematical explanations and numerous examples and exercises.

In many areas of mathematics some “higher operations” are arising. These havebecome so important that several research projects refer to such expressions. H

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