Restart
7 of 10
Which quantifier is used to express uniqueness in first order logic?
-
∀
-
∃!
-
∀∃
-
∃∀
That's Correct!
It's Wrong!
The quantifier used to express uniqueness in first-order logic is: ∃!
The symbol ∃! is read as "there exists a unique" and is used to assert that there is exactly one element satisfying a given property. It combines the existential quantifier (∃) with the uniqueness assertion (!). For example, ∃!x P(x) would be read as "There exists a unique x such that P(x) is true."
