The Logical Syntax of Language.

Rudolf Carnap's entire theory of Language structure came to me, he reports, like a vision during a sleepless night in January 1931, when I was ill. This theory appeared in The Logical Syntax of Language (1934). Carnap argued that many philosophical controversies really depend upon whether a particular language form should be used. This leads him to his famous Principle of tolerance by which everyone is free to mix and match the rules of his...