Abstract

This chapter presents a question closely related to the problem of vagueness, because it looks like a paradigm of a philosophical question that is implicitly but not explicitly about thought and language. It is useful to look at some proposals and arguments from the vagueness debate, for two reasons. First, they show why the original question is hard, when taken at face value. Second, they show how semantic considerations play a central role in the attempt to answer it, even though it is not itself a semantic question. Some philosophers deny the relevance of formal semantic theories to vague natural languages. Some contemporary metaphysicians appear to believe that they can safely ignore formal semantics and the philosophy of language because their interest is in a largely extra‐mental reality. Conceptions of logic and mathematics as somehow trivial or non‐substantial have not been vindicated by any clear explanation of the relevant sense of “trivial” or “non‐substantial.”