This is documentation for Mathematica 6, which was
based on an earlier version of the Wolfram Language.
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DifferentialD ()

DifferentialD[x]
displays as x.
Use Esc int Esc to enter and Esc dd Esc to enter :
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Use Ctrl+_ to enter the lower limit, then Ctrl+% for the upper limit:
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A multiple integral with x integration outermost:
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New in 6