I know $\exists$ means at least one element and here is answer for at most one. I have read that $!\exists$ means exactly one element, but can anyone confirm that?
2026-04-01 17:08:33.1775063313
Is there logical quantifier for unique element
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To denote that there exists a unique $x$ such that a statement $P(x)$ is true, we usually write:
$$\exists!x: P(x)$$