\gneq
The symbol \gneq is used to denote 'greater than or equal to' but negated, meaning 'not greater than or equal to'. It is used in mathematical expressions to specify that one quantity is neither greater than nor equal to another.
x is neither greater than nor equal to y
x \gneq y
The square of a is neither greater than nor equal to the square of b
a^2 \gneq b^2
The function f(x) is neither greater than nor equal to the function g(x) for given values of x
f(x) \gneq g(x)