Common Lisp the Language, 2nd Edition

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## 28.1.6. Generic Functions and Methods

A generic function is a function whose behavior depends on the classes or identities of the arguments supplied to it. The methods define the class-specific behavior and operations of the generic function. The following sections describe generic functions and methods.

- Introduction to Generic Functions
- Introduction to Methods
- Agreement on Parameter Specializers and Qualifiers
- Congruent Lambda-Lists for All Methods of a Generic Function
- Keyword Arguments in Generic Functions and Methods