My plan is to post translations of and comments on Ludwig Wittgenstein's Tractatus Logico-Philosophicus. Please feel free to comment.
5.51 If ξ has only one value then N(ξ) [with a line over it] = ~p (not p), if it has two values then N(ξ) [with a line over it] = ~p. ~q (neither p nor q).
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