The logical operator symbol `AA` represents a common quantifier in mathematical logic and it represents that the given proposition is true for any value of variable involved in proposition.

`a + 1/2 >= 2` , `AA a> 0` can be translated as the inequality `a + 1/2 >= 2` holds for any positive value of `a`

You may also notice that the above statement is not valid since not all positive values of `a` make the inequality to hold. Solving the inequality, you may find what are the real positive values of a that make the inequality possible.

`a >= 2 - 1/2 => a >= (4 - 1)/2 => a >= 3/2`

Hence, the given inequality is valid for all `( AA ) a>= 3/2` .

**Hence,as a conclusion regarding the logical operators, the logical
quantifier `AA` as well as the existential quantifier `EE` represents the most
common two logical operator symbols in theory of sets.**

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**Further Reading**