This is documentation for Mathematica 8, which was
based on an earlier version of the Wolfram Language.
View current documentation (Version 11.2)


  • Unicode: 222B.
  • Alias: Esc int Esc.
  • Compound operator with built-in evaluation rules.
  • f x is by default interpreted as Integrate.
  • f x is by default interpreted as . 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 .