The Theory of Structured Propositions and the Resolution of Problems with the Essential Indexical

摘要

John Perry laid out an argument that he believes falsified the structured theory of propositions. He claims that indexicals cannot be accounted for by this theory. I maintain that indexicals are unproblematic for structured proposition theory, and that Perry has mistakenly presupposed that knowledge is ‘black or white’ – one either knows or does not know – rather than adopting a more subtle definition of knowledge. I also argue that he further presupposed that humans will reason perfectly. Disputing this assumption and defining knowledge accurately resolve the issues posed by Perry. Some consequences of my notion of knowledge are discussed.