Completely Regular Semigroup Varieties A Comprehensive Study with Modern Insights

“This review treats the two volumes as a single whole. … One of the outstanding features consists of the Introduction and Review contained within each chapter and I can think of no better way to outline them than by quoting liberally from this material. … The first author passed away before the publication of these two volumes. He will be greatly missed.” (Peter R. Jones, Semigroup Forum, Vol. 111 (1), 2025) 

“Current advancements with their insights, related recent results and their methodologies etc. are nicely and elaborately included in this book and some of which are enlighted with in-depth understanding and special mention of the whole lattice of varieties of completely regular as a subdirect product of lattices which is in fact a remarkable theorem due to Pola’k. The book consists of an insightful and resourceful bibliography at the end.” (Sanjib Kumar Datta, zbMATH 1545.20001, 2024)