Mr. Wittgenstein’s explanation of his symbolism at this point is not quite fully given in the text. The symbol he uses is [ p ‾ , ξ ‾ , N ( ξ ‾ ) ] . The following is the explanation of this symbol:
- p ‾ stands for all atomic propositions.
- ξ ‾ stands for any set of propositions.
- N ( ξ ‾ ) stands for the negation of all the propositions making up ξ ‾ .