∨ Logical OR or AND operation If A or B (or both) is true, then proposition A ∨ B is true; If both are false, the proposition is false. n ≥ 4 ∨ n ≤ 2？ N ≠ 3, when n is a natural number or propositional logic, lattice theory

On the other hand, it means a certain number of indexes.