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  • Infix ordering operator.
  • x

    y is by default interpreted as NestedLessLess[x,y].
  • Used to denote "much less than".
  • Occasionally used in measure theory to denote "absolutely continuous with respect to".
  • See The Mathematica Book: Section 3.10.4.
  • See also: \[LessLess], \[NotLessLess], \[NotNestedLessLess].