NotLess
\[NotLess]
Alias: !<. Infix ordering operator. x y is by default interpreted as NotLess[x, y]. is equivalent to only for a totally ordered set. See The Mathematica Book: Section 3.10.4. See also: \[RawLess] .
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\[NotLess]
Alias: 
!<
y is by default interpreted as NotLess[x, y]. 
is equivalent to 
only for a totally ordered set. 
