Introduction To Applied Mathematics by Gilbert Strang

A concise introduction to core techniques of applied mathematics that develops tools such as linear algebra, ordinary and partial differential equations, Fourier series and transforms, Green’s functions, eigenfunction expansions, calculus of variations, and approximation methods; the book emphasizes modeling physical and engineering problems, intuitive derivations and practical solution methods for boundary-value and spectral problems, supported by examples and exercises to build problem-solving skills.

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