This classic textbook by C. Henry Edwards David E. Penney is widely regarded as a foundational resource for engineering and science students. The 6th Edition

Elementary Differential Equations with Boundary Value Problems by C. Henry Edwards and David E. Penney, now in its 6th Edition, remains one of the most widely used textbooks for undergraduate mathematics and engineering students. This edition balances the rigorous mathematical theory of differential equations with practical applications and computational tools.