"The book...presents the contemporary theory of categorical closure operators, one of the main branches of categorical topology. The purpose of the theory is to develop a categorical characterization of the classical topological concepts. It provides a tool that allows us to extend these concepts to an arbitrary category so that the results of the theory have many applications in other fields of mathematics, particularly topology, algebra, and discrete mathematics... The benefit of the book is that, after introducing the reader to the general theory, it presents a number of applications based on quite recent results achieved in this field. Thus the book provides basic literature for those interested in the theory of closure operators and its applications. It is an excellent exposition of a part of modern mathematics." - INTERNATIONALE MATHEMATISCHE NACHRICHTEN "The book under review puts its emphasis on giving a fairly elementary introduction in to the basic categorical theory of closure operators (Part I) and of their use in categorical topology (Part II), paying particular attention to the author's work on notions of connectedness... Each of the 17 section sof the book ends with a list of references for suggested further reading and a set of exercises, many of which ask the reader to verify claims made earlier in the text." ---ZENTRALBLATT MATH

• I GENERAL THEORY.- 1 Galois Connections.- 2 Some Categorical Concepts.- 3 Factorization Structures For Sinks.- 4 Closure Operators: Definition and Examples.- 5 Idempotency, Weak Heredity and Factorization Structures.- 6 Additivity, Heredity, Suprema and Infima of Closure Operators.- 7 Additional Descriptions of ? and ? and Subobject Orthogonality.- 8 A Diagram of Galois Connections of Closure Operators.- 9 Regular Closure Operators.- 10 Hereditary Regular Closure Operators.- 11 APPLICATIONS.- 11 Epimorphisms.- 12 Separation.- 13 Compactness.- 14 Connectedness.- 15 Connectedness in Categories with a Terminal Object.- 16 A Link between two Connectedness Notions.- 17 Different Constructions Related.- References.- List of Symbols.

"The book...presents the contemporary theory of categorical closure operators, one of the main branches of categorical topology. The purpose of the theory is to develop a categorical characterization of the classical topological concepts. It provides a tool that allows us to extend these concepts to an arbitrary category so that the results of the theory have many applications in other fields of mathematics, particularly topology, algebra, and discrete mathematics... The benefit of the book is that, after introducing the reader to the general theory, it presents a number of applications based on quite recent results achieved in this field. Thus the book provides basic literature for those interested in the theory of closure operators and its applications. It is an excellent exposition of a part of modern mathematics." - INTERNATIONALE MATHEMATISCHE NACHRICHTEN "The book under review puts its emphasis on giving a fairly elementary introduction in to the basic categorical theory of closure operators (Part I) and of their use in categorical topology (Part II), paying particular attention to the author's work on notions of connectedness... Each of the 17 section sof the book ends with a list of references for suggested further reading and a set of exercises, many of which ask the reader to verify claims made earlier in the text." ---ZENTRALBLATT MATH

• I GENERAL THEORY.- 1 Galois Connections.- 2 Some Categorical Concepts.- 3 Factorization Structures For Sinks.- 4 Closure Operators: Definition and Examples.- 5 Idempotency, Weak Heredity and Factorization Structures.- 6 Additivity, Heredity, Suprema and Infima of Closure Operators.- 7 Additional Descriptions of ? and ? and Subobject Orthogonality.- 8 A Diagram of Galois Connections of Closure Operators.- 9 Regular Closure Operators.- 10 Hereditary Regular Closure Operators.- 11 APPLICATIONS.- 11 Epimorphisms.- 12 Separation.- 13 Compactness.- 14 Connectedness.- 15 Connectedness in Categories with a Terminal Object.- 16 A Link between two Connectedness Notions.- 17 Different Constructions Related.- References.- List of Symbols.

"The book...presents the contemporary theory of categorical closure operators, one of the main branches of categorical topology. The purpose of the theory is to develop a categorical characterization of the classical topological concepts. It provides a tool that allows us to extend these concepts to an arbitrary category so that the results of the theory have many applications in other fields of mathematics, particularly topology, algebra, and discrete mathematics... The benefit of the book is that, after introducing the reader to the general theory, it presents a number of applications based on quite recent results achieved in this field. Thus the book provides basic literature for those interested in the theory of closure operators and its applications. It is an excellent exposition of a part of modern mathematics." - INTERNATIONALE MATHEMATISCHE NACHRICHTEN "The book under review puts its emphasis on giving a fairly elementary introduction in to the basic categorical theory of closure operators (Part I) and of their use in categorical topology (Part II), paying particular attention to the author's work on notions of connectedness... Each of the 17 section sof the book ends with a list of references for suggested further reading and a set of exercises, many of which ask the reader to verify claims made earlier in the text." ---ZENTRALBLATT MATH

• I GENERAL THEORY.- 1 Galois Connections.- 2 Some Categorical Concepts.- 3 Factorization Structures For Sinks.- 4 Closure Operators: Definition and Examples.- 5 Idempotency, Weak Heredity and Factorization Structures.- 6 Additivity, Heredity, Suprema and Infima of Closure Operators.- 7 Additional Descriptions of ? and ? and Subobject Orthogonality.- 8 A Diagram of Galois Connections of Closure Operators.- 9 Regular Closure Operators.- 10 Hereditary Regular Closure Operators.- 11 APPLICATIONS.- 11 Epimorphisms.- 12 Separation.- 13 Compactness.- 14 Connectedness.- 15 Connectedness in Categories with a Terminal Object.- 16 A Link between two Connectedness Notions.- 17 Different Constructions Related.- References.- List of Symbols.