 An inferentialist approach holds special appeal for the semantic anti-realist. According to Michael Dummett’s influential characterization of semantic realism, the realist is one who believes that every declarative sentence of one’s language is determinately true or false, independently of our means of coming to know which. This is what is supposed to justify the realist’s use of strictly classical logical principles such as the Law of Excluded Middle. The anti-realist, by contrast, insists that all truths are knowable; and is quick to point out that we do not have any effective method for deciding the truth or falsity of statements in mathematics. Anti-realists, accordingly, reject the Law of Excluded Middle (and all other strictly classical rules that are intuitionistically equivalent to it), and advocate the use of intuitionistic or constructive logic, rather than classical logic. 