The variable-proposition p ⊃ tildap ¤ is not identical with the variable-proposition ~(p . ~p). The corresponding universals would be identical. But the variable proposition ~(p . ~p) shews that out of ~(p . q) you get a tautology by substituting ~p for q, whereas the other does not say || shew this.

(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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