I'm trying to define the Uniqueness quantification $\exists ! $ in propositional logic. I am aware that it is possible to define it in predicate logic, as the Wikipedia page (and many answers here) shows, but as propositional is weaker, can we define this quantification in propositional? If not, why not?
2026-04-04 04:43:19.1775277799
Uniqueness quantification in propositional logic
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There are no quantifiers in propositional calculus.