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It is not the case that KQML's soundness proof applies only to closed formulas, leaving open whether CBF is provable for open formulas under extended interpretations.
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Reasons For
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Reason for
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1.
Open formulas are ubiquitous in logical systems; restricting soundness to closed formulas severely limits the practical utility of KQML.
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2.
Extended interpretations are standard in model theory; treating them as exceptional rather than routine suggests incomplete framework design.
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3.
The claim conflates technical proof presentation with actual soundness; CBF may be provable for open formulas via alternative approaches not yet explored.
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Reasons Against
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Reason against
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1.
Soundness proofs for closed formulas establish a foundational guarantee; extending them to open formulas requires additional technical machinery.
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2.
CBF under extended interpretations involves variable binding complexities absent in closed formulas, justifying separate proof requirements.
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3.
Acknowledging proof limitations for open formulas demonstrates intellectual honesty and prevents overconfidence in the system's scope.
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