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‘A set of truth-functors is said to be \emph{expressively adequate} (or sometimes \emph{functionally complete}) iff, for every truth-function whatever, there is a formula containing only those truth-functors which express that truth-function, i.e. which has as its truth-table the truth-table specifying that function.’ (Bostock, \emph{Intermediate Logic} p. 45)

Illustration of the proof that $\{$¬, ∧, ∨$\}$ is truth-functionally complete:

\emph{Exercise} assuming $\{$¬,∨,∧$\}$ is truth-functionally complete, show that $\{$¬,∨$\}$ is.

7.25, 7.26, *7.28, 7.29

7.25, 7.26, *7.28, 7.29