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The very possibility of Frege's explanations of “not-p” & “if p then q”, from which it follows that “not-not-p” denotes the same as p, makes it probable that there is some method of designation in which “not-not-p” corresponds to the same symbol as “p”. But if this method of designation suffices for logic, it must be the right one.

(2015–) Wittgenstein Source Bergen Nachlass Edition (WS-BNE). Edited by the Wittgenstein Archives at the University of Bergen under the direction of Alois Pichler. In: Wittgenstein Source, curated by Alois Pichler (2009–) and Joseph Wang-Kathrein (2020–). (N) Bergen: WAB.

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