The Mathematica Book Online: Mathematica Reference Guide | Some Notes on Internal Implementation

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Part A: Mathematica Reference Guide

Section A.9: Some Notes on Internal Implementation

A.9.1		Introduction
A.9.2		Data Structures and Memory Management
A.9.3		Basic System Features
A.9.4		Numerical and Related Functions
A.9.5		Algebra and Calculus
A.9.6		Output and Interfacing