Fixed Point Theory and Variational Principles in Metric Spaces by Qamrul Hasan Ansari and D.R. Sahu

This book, "Fixed Point Theory and Variational Principles in Metric Spaces," by Qamrul Hasan Ansari and D.R. Sahu, offers a comprehensive exploration of fixed point theory and its applications in metric spaces. It's a valuable resource for students and researchers seeking a deeper understanding of this crucial mathematical field.