Stephen Schiffer

Pleonastic entities are entities whose existence is secured by something-from-nothing transformations, these being conceptually valid inferences that take one from a statement in which no reference is made to a thing of a certain kind to a statement—often a pleonastic equivalent of the first statement—in which there is a reference to a thing of that kind. The possibility of pleonastic entities is further explained in terms of the notion of one theory being a conservative extension of another. Propositions are pleonastic entities, and the way in which they are individuated shows how pleonastic propositions are both fine-grained and unstructured.

When I was invited to participate in this symposium, I welcomed what I thought would be the opportunity to apply my views about the semantics and logic of vague language to the real-life problems of vagueness legal theorists worry about. I confess to having formed my ambition without a very clear sense of what jurisprudential problems might be illuminated by general theories of vagueness. To be sure, I was able to guess that a symposium on Vagueness and Law must have something to do with the dilemmas courts face when it is indeterminate how a legal dispute should be resolved. What I had not thought through was how philosophers like myself might help to illuminate those dilemmas by bringing to bear on them their own logico-semantical theories of vagueness. This was unfortunate because, having done a bit of homework, I have reached the conclusion that philosophical theories of vagueness, even if true, have nothing to offer jurisprudential concerns about vagueness. Once she is reminded of certain platitudes about vagueness, the legal theorist needs no further help from philosophers of language and logic. Let’s see why this is so