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Inverse View
It is not the case that Soundness requires not merely true premises but premises known to be true, as Sextus Empiricus argued against dogmatic claims of propositional certainty.
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Reasons For
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Reason for
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1.
Knowledge itself requires justification—requiring known premises creates circularity: we cannot establish knowledge without already having it.
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2.
Most successful sciences operate with high-confidence but non-certain premises; Sextus's standard would paralyze empirical inquiry.
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3.
Distinguishing 'true but unknown' from 'known' premises requires epistemology beyond logic; soundness should remain a logical rather than epistemological concept.
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Reasons Against
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Reason against
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1.
An argument's rational persuasiveness depends on justification quality, not just truth—we cannot rationally accept conclusions from premises we merely guess are true.
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2.
The regress problem shows that without known premises, we lack stopping points for justification chains, leaving all conclusions ultimately arbitrary.
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3.
Dogmatic claims to certainty often mask unexamined assumptions; demanding known premises prevents smuggling undefended beliefs into logical systems.
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