\[ReverseElement]
• Alias: mem.
• Infix set relation operator.
• x y is by default interpreted as ReverseElement[x, y].
• Not the same as \[SuchThat] .
• See Section 3.10.4.
• See also: \[Element] , \[NotReverseElement] .
Usage
\[ReverseElement] Notes
mem. 
y is by default interpreted as ReverseElement[x, y]. 
