Template:Individual-TLP-paragraph-en-5.502

5.502 Therefore I write instead of “(– – – – – T)(ξ, ....)”, “[math]\displaystyle{ N ( \bar{\xi} ) }[/math]”.

[math]\displaystyle{ N ( \bar{\xi} ) }[/math] is the negation of all the values of the propositional variable ξ.