Abstract for Linnebo’s Talk

Dummett’s notion of indefinite extensibility is influential but obscure. The notion figures centrally in a newer Dummettian argument for intuitionistic logic and anti-realism, distinct from his more famous older arguments to the same effect. Drawing on ideas from Dummett, a precise analysis of indefinite extensibility is proposed. This analysis is used to reconstruct the poorly understood newer argument. The plausibility of the resulting argument is assessed.