• Infix ordering operator. • xy 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 also: \[LessLess] , \[NotLessLess] , \[NotNestedLessLess] .
\[NestedLessLess]
y is by default interpreted as NestedLessLess[x, y]. 