DocumentationMathematicaThe Mathematica BookMathematica Reference GuideListing of Named Characters
NotElement
\[NotElement]
Alias: !el. Infix set relation operator with built-in evaluation rules. x y is by default interpreted as NotElement[x, y]. See Section 1.10.8 and Section 3.10.4. See also: \[Element] , \[NotReverseElement] .