\left \{ {{y=2} \atop {x=2}} \right. \leq \geq x^{2} \sqrt{x} \neq \pi \sqrt[n]{x} \frac{x}{y} \alpha \lim_{n \to \infty} a_n \int\limits^a_b {x} \, dx \geq x^{2} \\ \left[\begin{array}{ccc}1&2& ;3\\4&5&6\\7&8&9\en d{array}\right] \neq \left[\begin{array}{ccc}1&2& ;3\\4&5&6\\7&8&9\en d{array}\right]