\[NotSuperset]
• Alias: !sup.
• Infix set relation operator.
• x y is by default interpreted as NotSuperset[x, y].
• See Section 3.10.4.
• See also: \[NotSupersetEqual] , \[Superset] .
Usage
\[NotSuperset] Notes
!sup. 
y is by default interpreted as NotSuperset[x, y]. 
