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Tractatus Logico-Philosophicus by Ludwig Wittgenstein + comments  by Maarten Maartensz   



5.2341 The sense of a truth-function of p is a function of the sense of p. Negation, logical addition, logical multiplication, etc. etc. are operations. (Negation reverses the sense of a proposition.)

What is true is that the value of a truth-function of p is a function of the value of p - and whether the same applies to meaning or sense is doubtful. A more precise sense in which "Negation, logical addition, logical multiplication, etc. etc. are operations. (Negation reverses the sense of a proposition.)" can be taken from my last remark, with a formal statement of binary Boolean Algebra.