Details first-order linear and non-linear PDEs using methods like Lagrange’s and Charpit’s.
| Feature | B.D. Sharma | Erwin Kreyszig (Advanced Engg Math) | N.P. Bali | | :--- | :--- | :--- | :--- | | | Simple, direct | Academic, verbose | Moderate | | Problem Volume | Very High (500+ problems) | Moderate | High | | JEE Focus | Excellent | Poor (Western focus) | Good | | PDF Availability | Widely circulated | Hard to find legally | Widely available | | Best for | Cramming & Competitive exams | Concept depth | General revision | differential equation by bd sharma pdf
