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Logic  /  Logic 430  ·  Atom · ~20 seconds

Rebuttals vs. Undercutters

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A rebuttal argues the conclusion is false; an undercutter argues the support doesn't hold — leaving the conclusion open.

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"The witness is lying" rebuts nothing about the defendant; it undercuts one line of support.

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Confusing them overclaims: destroying an argument for p is not establishing not-p. That confusion has its own name.