Broadened Logic

摘要

The early formal logicians (Frege, Russell, Peano et al.) were worried about differentiating logic from psychology. As a result, they interpreted logic in the most abstract way possible: as a theory about inference patterns whose terms lacked descriptive content. Such a theory was also acontextual. What they did not realize was that psychological concepts like expecting someone, doubting, pain etc. each had their own logic, a logic that had two features: it was contextually oriented and its concepts had a restricted sensible application. This is still a recognizable sense of logic but broader in scope than the conceptions that Frege and Russell had in mind. This revised version was published online in June 2006 with corrections to the Cover Date.