《幺半群理论的同调方法(英文版)》主要内容：This book offers a comprehensive survey of the area of monoids。It includes injective and weakly injective S-acts，the concept of projective S-acts，some fundamental and interesting results concerning strong flatness，condition（P）and flatness of S-acts，some results on homological classification of monoids，the study of sheaves for classes of monoids and S-acts，analogous to the sheaves for classes of rings and modules。This volume will be of interest to researchers，graduate students and scientists of mathematics。