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2.7.1 Introduction to FUNCTION
The most important construct in CoCoA programming is the user-defined function. These functions take parameters, perform CoCoA commands, and return values. Collections of functions can be stored in text files and read into CoCoA sessions using source . To prevent name conflicts of the type that are likely to arise if functions are to be made available for use by others, the functions can be collected in packages.

To learn about user functions, look up define (online, enter ?define ).