| For instance Sheffer "puzzled that ' In order to give an account of logic, we must presuppose and employ logic ' " p | This is the word used by Kleene 1952:78• See discussion LOGICISM at pages 43—46 |
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| 4 Groping towards metalogic Grattan-Guinness 2000:454ff discusses the American logicians' critical reception of the second edition of PM | And Bernstein ended his 1926 review with the comment that "This distinction between the propositional logic as a mathematical system and as a language must be made, if serious errors are to be avoided; this distinction the Principia does not make" p |
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