A First Course in Fuzzy Logic, Fourth Edition by Hung T. Nguyen offers an expanded and comprehensive introduction to the theory and applications of fuzzy logic. This popular text provides a firm mathematical foundation for understanding the calculus of fuzzy concepts essential for designing intelligent systems, making it an ideal resource for both students and professionals. New to this edition, readers will find advances in the field with a focus on fuzzy sets of type-2. With 458 pages, this updated version is perfect for those looking to delve deeper into the subject and explore its real-world applications further.