\precnapproxThe symbol \precnapprox is used in mathematical notation to denote that one element is neither approximately less than nor equal to another element. It is a negated relation that combines the concepts of 'less than' and 'approximately equal to', indicating that the first element does not satisfy either condition in relation to the second element.
Element 'a' is neither approximately less than nor equal to element 'b'.
a \precnapprox bThe square of 'x' is neither approximately less than nor equal to the square of 'y'.
x^2 \precnapprox y^2The function 'f(x)' is neither approximately less than nor equal to the function 'g(x)' for given values of 'x'.
f(x) \precnapprox g(x)