The Mathematica Book, Fifth Edition – Legit

Numerical and symbolic calculations, building basic functions, and an introduction to the notebook interface. Part 2: Principles of Mathematica

Advanced calculus, linear algebra, and large-scale programming. Key Features and Content The Mathematica Book, Fifth Edition

Includes a comprehensive Reference Guide and an index with over 10,000 entries. Numerical and symbolic calculations

If you want to build your own complex tools, focus on the "Principles" section to understand expression evaluation. building basic functions

This is the "deep dive" into how the language actually works.

Full descriptions and usage for over 1,200 functions.

Functional programming, pattern matching, transformation rules, and how Mathematica represents and evaluates expressions. Part 3: Advanced Mathematics in Mathematica