It sounds like you're looking for the classic 1986 textbook by , Introduction to Applied Mathematics
This is an excellent request. Gilbert Strang’s Introduction to Applied Mathematics is a classic, but it is very different from his more famous Linear Algebra and Its Applications or Computational Science and Engineering . introduction to applied mathematics pdf gilbert strang
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The Masterpiece of Applied Math: A Look at Gilbert Strang’s Classic It sounds like you're looking for the classic