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- Compound operator with built-in evaluation rules.
 f  x is by default interpreted as Integrate[f, x].
 f  x is by default interpreted as Integral[f, {x, a, b}]. a and b must appear as a subscript and superscript, respectively.
 a  b  x is by default output as  (a  b)  x whenever  is an operator with a precedence lower than  .
- Note the use of
 , entered as Esc dd Esc or \[DifferentialD], rather than ordinary d.
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