User-defined functions can contain just about any CoCoA command and
may refer to other user-defined functions. The following are some
commands that pertain particularly to functions:
* Call -- apply a function to given arguments
* Define -- define a function
* Function -- return a function
* Functions -- list the functions of a package
* NewId -- create a new identifier
* Return -- exit from a structured command
* Var -- function calls by reference, other complex referencing
Details can be found by looking up each item by name. Online, try
'?ItemName' or 'H.Syntax("ItemName")'.
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