Auke, On that point, there is no disagreement whatsoever: AvB> The decision of what is obsolete or not must be based on a reality check and the context of his thought and experiences. Not on what is written last. On 2 June 1911, Peirce used a reality check to recognize that his presentation of EGs in 1906 was based on a mistake. On June 7, he began the development of a cleaner and more elegant version of EGs, which he presented in L231 (June 22). See http://jfsowa.com/peirce/eg1911.pdf . By every reality check with the development of logic in the 20th and 21st c, the version of eg1911.pdf has stood the test of time. But the version of 1906 received terrible reviews by Quine, Martin Gardner, and many others -- including Peirce himself, who called it "as bad as it could be" (L376, December 1911). The primary criterion for EGs is not "what was written last", but what Peirce himself wrote about his earlier versions of EGs. R670 (June 7), which led to L231 (June 22), is Peirce's own reality check on the version of 1906 (and R669, which he began to write as a rehash of the version of 1906). John
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