An inequality is strict if replacing any "less than" and "greater than" signs with equal signs never gives a true expression. For example, is not strict, whereas is.
Strict Inequality
See also
Equality, InequalityExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Strict Inequality." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/StrictInequality.html