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New help syntax and user defined help routines

Help is now also available using the ? syntax. For example, to see documentation for the mod operator, one simply types ?mod . The list of help topics is much more comprehensive than before. In addition, the help files themselves now include the actual Maple output.

The user may tell Maple how to generate help for a function ``foo'' by assigning the name `help/text/foo` to a TEXT object, e.g.


    > `help/text/foo` := TEXT(`this is line 1`,`and this is line 2`):
    ?foo

    this is line 1
    and this is line 2


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