6 The general form of truth function is: [ p ¯ , ξ ¯ , N ( ξ ¯ ) ] {\displaystyle [{\bar {p}},{\bar {\xi }},N({\bar {\xi }})]} .
This is the general form of proposition.
![{\displaystyle [{\bar {p}},{\bar {\xi }},N({\bar {\xi }})]}](https://wikimedia.org/api/rest_v1/media/math/render/svg/2280fc5b18f2a18924aeac15d592429f9a30389c)
.