
doi: 10.2307/2270973
In the literature of symbolic logic there are many examples of systems having free variables ranging over truth-values, individuals, or predicates. But, though many such systems are equipped with universal and existential quantifiers (and though many other quantifiers, e.g., for exactly one, are thereby definable), the problem of free variables corresponding to such constants has been neglected.
general logic, Mathematical logic and foundations
general logic, Mathematical logic and foundations
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