Edwards C. And D. Penney. Elementary Differential Equations With Boundary Value Problems. 6th Ed -

No textbook is perfect. The 6th edition’s coverage of for nonlinear systems is present but less extensive than in dedicated ODE texts like those by Hirsch and Smale. Also, the chapter on partial differential equations necessarily compresses material that could fill an entire separate course. Students taking advanced PDEs may still need a supplementary text.

Here is the proper bibliographic citation in format, which is the most common standard for this type of textbook: No textbook is perfect

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The 6th edition includes more worked examples of Bessel functions than earlier editions, plus tables of properties—extremely helpful for physics students encountering cylindrical coordinates. No textbook is perfect