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It is not the case that If some sign-inferences derive their epistemic force from logical necessity rather than accumulated observation, the inferential modes are irreducibly plural.
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Reasons For
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Reason for
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1.
Logical necessity itself may be grounded in regularities of how our cognitive systems evolved to process information reliably.
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2.
The claim conflates epistemic force (justification) with semantic source; plural justifications needn't entail irreducibly plural inferential modes.
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3.
Even deductive inference requires accumulated experience that logical symbols refer to anything; pure logic proves nothing about the world.
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Reasons Against
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Reason against
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1.
Logical necessity (like modus ponens) operates independently of empirical frequency; observation cannot ground what holds in all possible worlds.
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2.
If all inference modes shared one epistemic source, we could not explain why deductive and inductive arguments warrant different confidence levels.
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3.
Mathematical proof and perceptual inference have structurally distinct justificatory mechanisms that cannot be reduced to a single principle.
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