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- Unicode: 222B.
- Alias:
 int .
- Compound operator with built‐in evaluation rules.
 f  x is by default interpreted as Integrate[f,x].  f  x is by default interpreted as Integrate[f,{x,a,b}]. a and b must appear as a subscript and superscript, respectively.  is by default interpreted as Integrate[f,x∈reg], where the region is entered as an underscript.- Parentheses should be used in
 (a  b)  x whenever  is an operator with a precedence lower than  .
- Note the use of
 , entered as  dd or \[DifferentialD], rather than ordinary d.
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