At the end of each major section, Ahsan includes "Miscellaneous Problems" that mix ODEs and PDEs. These are excellent for self-assessment but notoriously tricky. If you solve all of them, you are ready for any Master's entrance exam.
Differential Equations and Their Applications by Zafar Ahsan is a widely recognized textbook designed for undergraduate students in mathematics, physics, and engineering. It bridges the gap between complex mathematical theory and practical, real-world utility. Google Books Core Content and Structure At the end of each major section, Ahsan