This is the first book about commutative semigroups in general. Emphasis is on structure but the other parts of the theory are at least surveyed and a full set

In semigroup theory there are certain kinds of band decompositions, which are very useful in the study of the structure semigroups. There are a number of specia

Commutative Semigroup Rings was the first exposition of the basic properties of semigroup rings. Gilmer concentrates on the interplay between semigroups and rin

This book provides an organized exposition of the current state of the theory of commutative semigroup cohomology, a theory which was originated by the author a