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References to 'truth function'
1. biconditional by Mathprof
2. every proposition is equivalent to a proposition in DNF by rspuzio
3. implication by akrowne
4. interpretation of well-formed formulas by CWoo
5. intuitionistic logic by gribskoff
6. logical axiom by CWoo
7. logical connective by mps
8. propositional logic by Henry
9. realization of a formula by a truth function by CWoo