Abstract
By a free logic is generally meant a variant of classical first-order logic in which constant terms may, under interpretation, fail to refer to individuals in the domain D over which the bound variables range, either because they do not refer at all or because they refer to individuals outside D. If D is identified with what is assumed by the given interpretation to exist, in accord with Quine’s dictum that “to be is to be the value of a [bound] variable,”1 then a free variation on classical semantics does not require that all constant terms refer to existents, and in this sense such terms lack existential import.
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Lehmann, S. (2002). More Free Logic. In: Gabbay, D.M., Guenthner, F. (eds) Handbook of Philosophical Logic. Handbook of Philosophical Logic, vol 5. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-0458-8_4
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