Recent Research Trends in Mathematics (Volume - 3), edited by Dr. Ruchika Mehta and Dr. Manoj Kumar Sharma, offers a comprehensive insight into contemporary mathematical research spanning diverse domains. This volume includes analytical work on time series forecasting using ARIMA models, innovative applications of fuzzy logic for COVID-19 delta variant diagnosis, philosophical and structural retrospectives on mathematical foundations, and advancements in general relativity and operator theory. It brings together practical implementations and theoretical perspectives, making it an essential reference for researchers, academicians, and postgraduate students engaged in applied mathematics, computational science, and interdisciplinary studies.