Authors: Colin James III
We evaluate the logic system PŁ4 as refuting and replacing VŁ4. Eight modal theses and two axioms are not tautologous and contrary to those of PŁ4. This denies that PŁ4 refutes VŁ4, refutes PŁ4, and justifies VŁ4 as containing the non bivalent fragment named PŁ4.
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