User Guide

Error, (in sum) summation variable previously assigned, second argument evaluates
to 4 = 1 .. 5
Note: In general, it is recommended that you unassign a name to use it as a
variable. See Unassigning a Name Using Unevaluation Quotes (page 319).
To use an assigned name as a variable:
• Enclose the name in unevaluation quotes. Maple passes the name to the
command.
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Important: It is recommended that you enclose keywords in unevaluation
quotes.
For example, if you enclose the keyword left in unevaluation quotes, Maple
uses the name, not its assigned value.
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Full Evaluation of an Expression in Quotes
Full evaluation of a quoted expression removes one set of right single quotes.
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318 • 7 Maple Expressions