DocumentationMathematicaThe Mathematica BookMathematica Reference GuideListing of Named Characters
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 Section 3.10.4.
See also: \[LessLess] , \[NotLessLess] , \[NotNestedLessLess] .