Dummett's work on the German philosopher
Frege has been acclaimed. His first book
Frege: Philosophy of Language (1973), written over many years, is seen as a classic. It was instrumental in the rediscovery of Frege's work, and influenced a generation of British philosophers. In his 1963 paper "Realism", he popularised a controversial approach to understanding the historical dispute between
realist and other non-realist philosophy such as
idealism,
nominalism,
irrealism. He classed all the latter as
anti-realist and argued that the fundamental disagreement between realist and anti-realist was over the nature of truth. For Dummett, realism is best understood as
semantic realism, i.e. the view that every declarative sentence in one's language is
bivalent (determinately true or false) and
evidence-transcendent (independent of our means of coming to know which), Historically, these debates had been understood as disagreements about whether a certain type of entity objectively exists or not. Thus we may speak of realism or anti-realism with respect to other minds, the past, the future, universals, mathematical entities (such as
natural numbers), moral categories, the material world, or even thought. The novelty of Dummett's approach consisted in seeing these disputes as at base analogous to the dispute between
intuitionism and
Platonism in the
philosophy of mathematics. Dummett espoused
semantic anti-realism, a position suggesting that truth cannot serve as the central notion in the theory of meaning and must be replaced by
verifiability. Semantic anti-realism is sometimes related to
semantic inferentialism. ==Activism==