If incompatibility of opposite-of-consequent with antecedent does not guarantee universal validity, the incompatibility relation itself must be non-formal, undermining the original classification.
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A description of which sentences in a schematic argument are premises and which are conclusions, together with a specification of what rules of inference are used.
incompatibility(Characterized as an apparently negative notion, which creates a problem for the positive truth-maker proposal.)
A relation that obtains between two states when it is not possible for them to obtain together.
universal validity(Proposed as both necessary and sufficient for logical truth in a standard mathematical characterization alternative to derivability.)
A sentence is universally valid when no collective assignment of meanings to the variables and the schematic letters in its logical form would turn that form into a false sentence.